315625
domain: N
Appears in sequences
- Numbers k such that k | 4^k + 1.at n=23A015950
- Numbers k such that k | 9^k + 1.at n=20A015957
- Numbers k that divide 4^k + 1, k not a power of 5.at n=15A015974
- Quotient of 'base-2' division described in A032533.at n=21A032534
- Numbers j that are the hypotenuse of exactly 16 distinct integer-sided right triangles, i.e., j^2 can be written as a sum of two squares in 16 ways.at n=22A097238