A246497 Smallest k such that 9^^n is not congruent to 9^^(n-1) mod k, where 9^^n denotes the power tower 9^9^...^9 (in which 9 appears n times).

3, 7, 23, 47, 283, 719, 1439, 2879, 34549, 138197, 1266767, 14619833, 36449279, 377982107, 1432349099

Offset

1,1

Comments

For general remarks regarding sequences of this type, see A246491.

This particular sequence shares all known terms with A082449. they might be identical.

Links

Table of n, a(n) for n=1..15.

Prog

(SageMath) # Use linked source from A246491 with this command: find_k_values(9, 1, 1)

Crossrefs

Cf. A082449, A027763, A246491, A246492, A246493, A246494, A246495, A246496.

Sequence in context: A014426 A054270 A058000 * A002715 A112052 A205491

Adjacent sequences: A246494 A246495 A246496 * A246498 A246499 A246500

Keyword

nonn,more

Author

Wayne VanWeerthuizen, Aug 27 2014

Status

approved