Keith numberIn recreational mathematics, a Keith number or repfigit number (short for repetitive Fibonacci-like digit) is a natural number n {\displaystyle n} in a given number base b {\displaystyle b} with k {\displaystyle k} digits such that when a sequence is created such that the first k {\displaystyle k} terms are the k {\displaystyle k} digits of n {\displaystyle n} and each subsequent term is the sum of the previous k {\displaystyle k} terms, n {\displaystyle n} is part of the sequence.Nonagonal numberA nonagonal number, or an enneagonal number, is a figurate number that extends the concept of triangular and square numbers to the nonagon (a nine-sided polygon). However, unlike the triangular and square numbers, the patterns involved in the construction of nonagonal numbers are not rotationally symmetrical.
Pentagonal numberA pentagonal number is a figurate number that extends the concept of triangular and square numbers to the pentagon, but, unlike the first two, the patterns involved in the construction of pentagonal numbers are not rotationally symmetrical. The nth pentagonal number pn is the number of distinct dots in a pattern of dots consisting of the outlines of regular pentagons with sides up to n dots, when the pentagons are overlaid so that they share one vertex.
Ordered Bell numberIn number theory and enumerative combinatorics, the ordered Bell numbers or Fubini numbers count the weak orderings on a set of n{\displaystyle n} elements. Weak orderings arrange their elements into a sequence allowing ties, such as might arise as the outcome of a horse race. The ordered Bell numbers were studied in the 19th century by Arthur Cayley and William Allen Whitworth.
76 (number)←70717273747576777879→List of numbersIntegers←0102030405060708090→Cardinalseventy-sixOrdinal76th(seventy-sixth)Factorization2 × 19Divisors1, 2, 4, 19, 38, 76Greek numeralΟϚ´Roman numeralLXXVI, lxxviBinary10011002Ternary22113Senary2046Octal1148Duodecimal6412Hexadecimal4C1676 (seventy-six) is the natural number following 75 and preceding 77. In mathematics76 is: a composite number; a square-prime, of the form (p, q) where q is a higher prime.
Natural numberIn mathematics, the natural numbers are the numbers used for counting up, starting from 0 or 1. The first few natural numbers are 0 (if included), 1, 2, 3, and so on. The terms positive integers, non-negative integers, whole numbers, and counting numbers are also used. The set of the natural numbers is commonly denoted by a bold N or a blackboard boldN{\displaystyle \mathbb {N} }.Self numberIn number theory, a self number in a given number base b {\displaystyle b} is a natural number that cannot be written as the sum of any other natural number n {\displaystyle n} and the individual digits of n {\displaystyle n} . 20 is a self number (in base 10), because no such combination can be found (all n < 15 {\displaystyle n<15} give a result less than 20; all other n {\displaystyle n} give a result greater than 20).
74 (number)←70717273747576777879→List of numbersIntegers←0102030405060708090→Cardinalseventy-fourOrdinal74th(seventy-fourth)Factorization2 × 37Divisors1, 2, 37, 74Greek numeralΟΔ´Roman numeralLXXIV, lxxivBinary10010102Ternary22023Senary2026Octal1128Duodecimal6212Hexadecimal4A1674 (seventy-four) is the natural number following 73 and preceding 75.
FibonacciLeonardo Bonacci, also Leonardo da Pisa (c. 1170 – c. 1240-50), commonly known as Fibonacci, was an Italianmathematician from the Republic of Pisa, considered to be "the most talented Western mathematician of the Middle Ages". The name he is commonly called, Fibonacci, is first found in a modern source in a 1838 text by the Franco-Italian mathematician Guglielmo Libri and is short for filius Bonacci ('son of Bonacci').
Pyramidal numberA pyramidal number is the number of points in a pyramid with a polygonal base and triangular sides. The term often refers to square pyramidal numbers, which have a square base with four sides, but it can also refer to a pyramid with any number of sides. The numbers of points in the base and in layers parallel to the base are given by polygonal numbers of the given number of sides, while the numbers of points in each triangular side is given by a triangular number.
7−10123456789→List of numbersIntegers←0102030405060708090→CardinalsevenOrdinal7th(seventh)Numeral systemseptenaryFactorizationprimePrime4thDivisors1, 7Greek numeralΖ´Roman numeralVII, viiGreekprefix/Latinprefix/Binary1112Ternary213Senary116Octal78Duodecimal712Hexadecimal716Greek numeralZ, ζAmharic፯Arabic, Kurdish, Persian٧Sindhi, Urdu۷Bengali৭Chinese numeral七, 柒Devanāgarī७Santali᱗Telugu౭Tamil௭HebrewזKhmer៧Thai๗Kannada೭Malayalam൭ArmenianԷBabylonian numeral𒐛Egyptian hieroglyph𓐀Morse code_ _...7 (seven) is the natural number following 6 and preceding 8.
DecimalNumber in base-10 numeral system Place value of number in decimal system Part of a series onNumeral systems Place-value notation Hindu–Arabic numerals Western Arabic Eastern Arabic Bengali Devanagari Gujarati Gurmukhi Odia Sinhala Tamil Malayalam Telugu Kannada Dzongkha Tibetan Balinese Burmese Javanese Khmer Lao Mongolian Sundanese Thai Other systems History Ancient Babylonian Post-classical Cistercian Mayan Muisca Pentadic Quipu Rumi Contemporary Cherokee Kaktovik (Iñupiaq) By radix/base Common radices/bases 2 3 4 5 6 8 10 11 12 16 20 60 Non-standard radices/bases Bijective (1) Signed-digit (balanced ternary) Mixed (factorial) Negative Complex (2i) Non-integer (φ) Asymmetric Sign-value notation Non-alphabetic Contemporary East Asian Chinese Hokkien Suzhou Japanese Korean Vietnamese Historic East Asian Counting rods Tangut Other non-alphabetic Aegean Attic Aztec Brahmi Chuvash Egyptian Etruscan Kharosthi Prehistoric counting Proto-cuneiform Roman Tally marks Alphabetic Abjad Armenian Alphasyllabic Akṣarapallī Āryabhaṭa Kaṭapayādi Coptic Cyrillic Geʽez Georgian Glagolitic Greek Hebrew List of numeral systemsvte A decimal system (also called base-ten, denary or decenary) is a numeral system that uses ten as its radix (base).
Pentagonal numberA pentagonal number is a figurate number that extends the concept of triangular and square numbers to the pentagon, but, unlike the first two, the patterns involved in the construction of pentagonal numbers are not rotationally symmetrical. The nth pentagonal number pn is the number of distinct dots in a pattern of dots consisting of the outlines of regular pentagons with sides up to n dots, when the pentagons are overlaid so that they share one vertex.Ordered Bell numberIn number theory and enumerative combinatorics, the ordered Bell numbers or Fubini numbers count the weak orderings on a set of n{\displaystyle n} elements. Weak orderings arrange their elements into a sequence allowing ties, such as might arise as the outcome of a horse race. The ordered Bell numbers were studied in the 19th century by Arthur Cayley and William Allen Whitworth.76 (number)←70717273747576777879→List of numbersIntegers←0102030405060708090→Cardinalseventy-sixOrdinal76th(seventy-sixth)Factorization2 × 19Divisors1, 2, 4, 19, 38, 76Greek numeralΟϚ´Roman numeralLXXVI, lxxviBinary10011002Ternary22113Senary2046Octal1148Duodecimal6412Hexadecimal4C1676 (seventy-six) is the natural number following 75 and preceding 77. In mathematics76 is: a composite number; a square-prime, of the form (p, q) where q is a higher prime.Natural numberIn mathematics, the natural numbers are the numbers used for counting up, starting from 0 or 1. The first few natural numbers are 0 (if included), 1, 2, 3, and so on. The terms positive integers, non-negative integers, whole numbers, and counting numbers are also used. The set of the natural numbers is commonly denoted by a bold N or a blackboard boldN{\displaystyle \mathbb {N} }.Self numberIn number theory, a self number in a given number base b {\displaystyle b} is a natural number that cannot be written as the sum of any other natural number n {\displaystyle n} and the individual digits of n {\displaystyle n} . 20 is a self number (in base 10), because no such combination can be found (all n < 15 {\displaystyle n<15} give a result less than 20; all other n {\displaystyle n} give a result greater than 20).74 (number)←70717273747576777879→List of numbersIntegers←0102030405060708090→Cardinalseventy-fourOrdinal74th(seventy-fourth)Factorization2 × 37Divisors1, 2, 37, 74Greek numeralΟΔ´Roman numeralLXXIV, lxxivBinary10010102Ternary22023Senary2026Octal1128Duodecimal6212Hexadecimal4A1674 (seventy-four) is the natural number following 73 and preceding 75.FibonacciLeonardo Bonacci, also Leonardo da Pisa (c. 1170 – c. 1240-50), commonly known as Fibonacci, was an Italianmathematician from the Republic of Pisa, considered to be "the most talented Western mathematician of the Middle Ages". The name he is commonly called, Fibonacci, is first found in a modern source in a 1838 text by the Franco-Italian mathematician Guglielmo Libri and is short for filius Bonacci ('son of Bonacci').Pyramidal numberA pyramidal number is the number of points in a pyramid with a polygonal base and triangular sides. The term often refers to square pyramidal numbers, which have a square base with four sides, but it can also refer to a pyramid with any number of sides. The numbers of points in the base and in layers parallel to the base are given by polygonal numbers of the given number of sides, while the numbers of points in each triangular side is given by a triangular number.7−10123456789→List of numbersIntegers←0102030405060708090→CardinalsevenOrdinal7th(seventh)Numeral systemseptenaryFactorizationprimePrime4thDivisors1, 7Greek numeralΖ´Roman numeralVII, viiGreekprefix/Latinprefix/Binary1112Ternary213Senary116Octal78Duodecimal712Hexadecimal716Greek numeralZ, ζAmharic፯Arabic, Kurdish, Persian٧Sindhi, Urdu۷Bengali৭Chinese numeral七, 柒Devanāgarī७Santali᱗Telugu౭Tamil௭HebrewזKhmer៧Thai๗Kannada೭Malayalam൭ArmenianԷBabylonian numeral𒐛Egyptian hieroglyph𓐀Morse code_ _...7 (seven) is the natural number following 6 and preceding 8.DecimalNumber in base-10 numeral system Place value of number in decimal system Part of a series onNumeral systems Place-value notation Hindu–Arabic numerals Western Arabic Eastern Arabic Bengali Devanagari Gujarati Gurmukhi Odia Sinhala Tamil Malayalam Telugu Kannada Dzongkha Tibetan Balinese Burmese Javanese Khmer Lao Mongolian Sundanese Thai Other systems History Ancient Babylonian Post-classical Cistercian Mayan Muisca Pentadic Quipu Rumi Contemporary Cherokee Kaktovik (Iñupiaq) By radix/base Common radices/bases 2 3 4 5 6 8 10 11 12 16 20 60 Non-standard radices/bases Bijective (1) Signed-digit (balanced ternary) Mixed (factorial) Negative Complex (2i) Non-integer (φ) Asymmetric Sign-value notation Non-alphabetic Contemporary East Asian Chinese Hokkien Suzhou Japanese Korean Vietnamese Historic East Asian Counting rods Tangut Other non-alphabetic Aegean Attic Aztec Brahmi Chuvash Egyptian Etruscan Kharosthi Prehistoric counting Proto-cuneiform Roman Tally marks Alphabetic Abjad Armenian Alphasyllabic Akṣarapallī Āryabhaṭa Kaṭapayādi Coptic Cyrillic Geʽez Georgian Glagolitic Greek Hebrew List of numeral systemsvte A decimal system (also called base-ten, denary or decenary) is a numeral system that uses ten as its radix (base).*As an Amazon Associate I earn from qualifying purchases.