A292331 Numbers k such that k^2 divides 5^k + 1.

1, 3, 21, 609, 903, 2667, 9429, 26187, 77343, 114681, 159663, 212541, 273441, 405447, 1197483, 1357503, 1398747, 3325749, 4451181, 4630227, 6099429, 6865509, 8620941, 9139263, 11757963, 13047447, 20277201, 26992707, 34727007, 37088709, 38596929, 39367587, 40563663, 51491769, 58372629, 59280123, 63002541, 71688687, 95430909

Offset: 1

Author

Max Alekseyev, Sep 14 2017

Keywords

• nonn

Links

• Max Alekseyev, Table of n, a(n) for n = 1..88

Crossrefs

Subsequence of A015951.

Cf. A127105, A128679.