A177914 Numbers k such that k^3 divides 14^(k^2) - 1.

1, 13, 2041, 8801, 1381757, 24355253, 249302027, 464754407, 2681233451, 16488506281, 16772956369, 39665616523, 72966441899, 168777472279, 388885239223, 420953651807, 2974921088191, 3487599163841

Offset

1,2

Comments

13 divides a(n) for n > 1.

Links

Table of n, a(n) for n=1..18.

Mathematica

Join[{1}, Select[Range[2000000], PowerMod[14, #^2, #^3] == 1 &]] (* Robert Price, Mar 31 2020 *)

Crossrefs

Cf. A014956 (k divides 14^k-1), A128394 (k^2 divides 14^k-1).

Cf. A129211, A129212, A177905, A127106, A177907, A127102, A177909, A177243.

Cf. A177911, A177912, A177913, A177914, A177915, A177916, A177917, A177918, A177919, A177920.

Sequence in context: A347847 A340139 A263221 * A128394 A196801 A196589

Adjacent sequences: A177911 A177912 A177913 * A177915 A177916 A177917

Keyword

more,nonn

Author

Alexander Adamchuk, May 14 2010

Extensions

More terms from Max Alekseyev, Oct 02 2010

Status

approved