A366716 a(n) = phi(12^n+1), where phi is Euler's totient function (A000010).

1, 12, 112, 1296, 20416, 229680, 2306304, 32916240, 400515072, 3863116800, 47825825600, 685853880624, 8732596764672, 97509650382144, 990242755633152, 11148606564480000, 184883057981234176, 2047145911595946000, 20281543142263603200, 294779525244632305920

Offset: 0

Author

Sean A. Irvine, Oct 17 2023

Keywords

• nonn

Links

• Max Alekseyev, Table of n, a(n) for n = 0..306

Crossrefs

Cf. A178248, A000010, A366711, A366712, A366713, A366714, A366715, A366719, A366720, A366690.

Programs

Mathematica

EulerPhi[12^Range[0,19] + 1] (* Paul F. Marrero Romero, Oct 27 2023 *)

PARI

{a(n) = eulerphi(12^n+1)}

Formula

a(n) = A000010(A178248(n)). - Paul F. Marrero Romero, Oct 27 2023