A366685 - OEIS

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A366685

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

15

4, 32, 432, 3840, 64400, 373248, 7613424, 56217600, 765889344, 6913984000, 114117380608, 599824465920, 13796450740800, 98909341090560, 1356399209088000, 11341872916070400, 202178811399717504, 1171410130065973248, 24463636179365818512, 176391086415667200000

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

OFFSET

1,1

LINKS

Max Alekseyev, Table of n, a(n) for n = 1..316

MATHEMATICA

EulerPhi[11^Range[30] - 1]

PROG

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

CROSSREFS

phi(k^n-1): A053287 (k=2), A295500 (k=3), A295501 (k=4), A295502 (k=5), A366623 (k=6), A366635 (k=7), A366654 (k=8), A366663 (k=9), A295503 (k=10), this sequence (k=11), A366711 (k=12).

Cf. A000010, A024127, A366681, A366682, A366683, A366684.

Sequence in context: A222685 A322735 A140178 * A088991 A009668 A005121

Adjacent sequences: A366682 A366683 A366684 * A366686 A366687 A366688

KEYWORD

nonn

AUTHOR

Sean A. Irvine, Oct 16 2023

STATUS

approved