49 (number)
49 (forty-nine) is the natural number following 48 (number), 48 and preceding 50 (number), 50. In mathematics Forty-nine is the square of 7, seven. It appears in the Padovan sequence, preceded by the terms 21, 28, 37 (it is the sum of the first two of these). Along with the number that immediately derives from it, 77, the only number under 100 (number), 100 not having its home prime known (). Decimal representation The sum of the digits of the square of 49 (2401) is the square root of 49. 49 is the first square where the digits are squares. In this case, 4 and 9 are squares. Reciprocal The fraction is a repeating decimal with a period of 42: : = (42 digits repeat) There are 42 (note that this number is the period) positive integers that are less than 49 and coprime to 49. Multiplying 020408163265306122448979591836734693877551 by each of these integers results in a cyclic permutation of the original number: *020408163265306122448979591836734693877551 × 2 = 040 ...
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