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

Author

Wayne VanWeerthuizen, Aug 27 2014

Keywords

• nonn
• more

Comments

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

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

Crossrefs

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