A180060 - OEIS

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A180060

a(n) = 2^(2^n mod n) mod n.

0, 1, 1, 1, 4, 4, 4, 1, 4, 6, 4, 4, 4, 2, 1, 1, 4, 16, 4, 16, 4, 16, 4, 16, 3, 16, 13, 16, 4, 16, 4, 1, 25, 16, 29, 16, 4, 16, 22, 16, 4, 16, 4, 20, 32, 16, 4, 16, 22, 16, 1, 16, 4, 52, 8, 32, 28, 16, 4, 16, 4, 16, 4, 1, 61, 16, 4, 52, 49, 46, 4, 16, 4, 16, 31, 24, 36, 16, 4, 16

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = 2^A015910(n) mod n.

MATHEMATICA

Table[Mod[2^(Mod[2^n, n]), n], {n, 50}] (* Alonso del Arte, Jan 14 2011 *)

Table[PowerMod[2, PowerMod[2, n, n], n], {n, 80}] (* Harvey P. Dale, Oct 09 2019 *)

CROSSREFS

Cf. A000079, A179976.