A246495 Smallest k such that 7^^n is not congruent to 7^^(n-1) mod k, where 7^^n denotes the power tower 7^7^...^7 (in which 7 appears n times).

4, 5, 11, 23, 47, 283, 719, 1439, 2879, 34549, 138197, 1266767, 4782969, 14348907

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..14.

Prog

(Sage, cython) Use linked source from A246491 with this command: find_k_values(7, 1, 1)

Crossrefs

Cf. A027763, A246491, A246492, A246493, A246494, A246496, A246497

Sequence in context: A279710 A303956 A000769 * A050831 A056799 A216963

Adjacent sequences: A246492 A246493 A246494 * A246496 A246497 A246498

Keyword

nonn,more

Author

Wayne VanWeerthuizen, Aug 27 2014

Status

approved