A128394 Numbers k such that k^2 divides 14^k - 1.

1, 13, 2041, 24355253, 249302027, 16772956369, 39665616523, 388885239223, 2974921088191, 3487599163841, 61054982558011, 200151688351277, 473329801968959

Offset

1,2

Comments

13 divides all except the first term.

Links

Table of n, a(n) for n=1..13.

Crossrefs

Cf. A127103, A127104, A127105, A127106, A127107, A127102, A127101, A127100, A127092, A128405, A128393, A128395, A128396, A128397, A128398, A128399, A128400, A128401, A128402, A128403, A128404.

Sequence in context: A340139 A263221 A177914 * A196801 A196589 A197046

Adjacent sequences: A128391 A128392 A128393 * A128395 A128396 A128397

Keyword

more,nonn,less

Author

Alexander Adamchuk, Mar 01 2007

Extensions

a(4)-a(5) from Farideh Firoozbakht, Mar 05 2007

a(6)-a(13) from Max Alekseyev, May 06 2010

Status

approved