A366690 - OEIS

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A366690

a(n) = phi(11^n+1), where phi is Euler's totient function (A000010).

1, 4, 60, 432, 7320, 53680, 803520, 6495720, 100874752, 764738496, 12756110400, 89493288192, 1568774615040, 11278053084480, 180228847518720, 1310982643872000, 22974417331646464, 168479281019744640, 2521788545778163200, 20190830281379049600

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

OFFSET

0,2

LINKS

Max Alekseyev, Table of n, a(n) for n = 0..325

FORMULA

a(n) = A000010(A034524(n)). - Paul F. Marrero Romero, Nov 10 2023

MATHEMATICA

EulerPhi[11^Range[0, 19] + 1] (* Paul F. Marrero Romero, Nov 10 2023 *)

PROG

(PARI) {a(n) = eulerphi(11^n+1)}

CROSSREFS

Cf. A034524, A000010, A062308, A366685, A366686, A366687, A366689, A366689, A366716.

Sequence in context: A234952 A112041 A210425 * A002060 A247739 A007220

Adjacent sequences: A366687 A366688 A366689 * A366691 A366692 A366693

KEYWORD

nonn

AUTHOR

Sean A. Irvine, Oct 16 2023

STATUS

approved