148 (one hundred
ndforty-eight) is the
natural number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country").
Numbers used for counting are called ''cardinal ...
following
147 and before
149.
In mathematics
148 is the second number to be both a
heptagonal number A heptagonal number is a figurate number that is constructed by combining heptagons with ascending size. The ''n''-th heptagonal number is given by the formula
:H_n=\frac.
The first few heptagonal numbers are:
: 0, 1, 7, 18, 34, 55, 81, 112 ...
and a
centered heptagonal number
A centered heptagonal number is a centered figurate number that represents a heptagon with a dot in the center and all other dots surrounding the center dot in successive heptagonal layers. The centered heptagonal number for ''n'' is given by ...
(the first is 1). It is the twelfth member of the
Mian–Chowla sequence
In mathematics, the Mian–Chowla sequence is an integer sequence defined
recursively in the following way. The sequence starts with
:a_1 = 1.
Then for n>1, a_n is the smallest integer such that every pairwise sum
:a_i + a_j
is distinct, for ...
, the lexicographically smallest sequence of distinct positive integers with distinct pairwise sums.
There are 148
perfect graph
In graph theory, a perfect graph is a graph in which the chromatic number of every induced subgraph equals the order of the largest clique of that subgraph (clique number). Equivalently stated in symbolic terms an arbitrary graph G=(V,E) is perfe ...
s with six
vertices, and 148 ways of partitioning four people into subsets, ordering the subsets, and selecting a leader for each subset.
In other fields
In the
Book of Nehemiah 7:44 there are 148 singers, sons of
Asaph, at the census of men of
Israel
Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated ...
upon return from exile. This differs from
Ezra
Ezra (; he, עֶזְרָא, '; fl. 480–440 BCE), also called Ezra the Scribe (, ') and Ezra the Priest in the Book of Ezra, was a Jewish scribe ('' sofer'') and priest (''kohen''). In Greco-Latin Ezra is called Esdras ( grc-gre, Ἔσδρα ...
2:41, where the number is given as 128.
Dunbar's number
Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person. This ...
is a theoretical cognitive limit to the number of people with whom one can maintain stable
interpersonal relationship
The concept of interpersonal relationship involves social associations, connections, or affiliations between two or more people. Interpersonal relationships vary in their degree of intimacy or self-disclosure, but also in their duration, in t ...
s. Dunbar predicted a "mean group size" of 148,
but this is commonly rounded to 150.
See also
* The year
AD 148
Year 148 ( CXLVIII) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Cornelius and Calpernius (or, less frequently, year 901 ''Ab urbe con ...
or
148 BC
__NOTOC__
Year 148 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Magnus and Caesoninus (or, less frequently, year 606 ''Ab urbe condita''). The denomination 148 BC for this year has bee ...
*
List of highways numbered 148
*
References
{{DEFAULTSORT:148 (Number)
Integers