A246492 Smallest k such that 4^^n is not congruent to 4^^(n-1) mod k, where 4^^n denotes the power tower 4^4^...^4 (in which 4 appears n times).

2, 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(4, 1, 1)

Crossrefs

Cf. A027763, A246491, A246493, A246494, A246495, A246496, A246497

Sequence in context: A261201 A055011 A007505 * A059411 A126017 A292937

Adjacent sequences: A246489 A246490 A246491 * A246493 A246494 A246495

Keyword

nonn,more

Author

Wayne VanWeerthuizen, Aug 27 2014

Status

approved