It appears in the Padovan sequence, preceded by the terms 21, 28, 37 (it is the sum of the first two of these).
49 is the smallest discriminant of a totally real cubic field.
[2] 49 and 94 are the only numbers below 100 whose all permutations are composites but they are not multiples of 3, repdigits or numbers which only have digits 0, 2, 4, 5, 6 and 8, even excluding the trivial one digit terms.
The fraction 1/49 is a repeating decimal with a period of 42: There are 42 positive integers less than 49 and coprime to 49.
Multiplying 020408163265306122448979591836734693877551 by each of these integers results in a cyclic permutation of the original number: The repeating number can be obtained from 02 and repetition of doubles placed at two places to the right: because 1⁄49 satisfies: Forty-nine is: