A128398 Numbers k such that k^2 divides 18^k - 1.

1, 17, 128583032925805678351

Offset

1,2

Comments

17 divides a(n) for n > 1.

a(4) > 10^50. - Max Alekseyev, Mar 01 2025

Links

Table of n, a(n) for n=1..3.

Crossrefs

Subsequence of A128358.

Cf. A127103, A127104, A127105, A127106, A127107, A127102, A127101, A127100, A127092, A128405, A128393, A128394, A128395, A128396, A128397, A128398, A128399, A128400, A128401, A128402, A128403, A128404.

Sequence in context: A114432 A134686 A257305 * A257377 A246649 A210709

Adjacent sequences: A128395 A128396 A128397 * A128399 A128400 A128401

Keyword

bref,hard,more,nonn

Author

Alexander Adamchuk, Mar 08 2007

Status

approved