The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A366685 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

A366685

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

#9 by Max Alekseyev at Thu Jan 04 19:14:41 EST 2024

STATUS

editing

approved

#8 by Max Alekseyev at Thu Jan 04 19:14:39 EST 2024

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. A024127, A000010, A295503, A366711, A024127, A366681, A366682, A366683, A366684.

STATUS

approved

editing

#7 by OEIS Server at Thu Jan 04 16:14:13 EST 2024

LINKS

Max Alekseyev, <a href="/A366685/b366685_1.txt">Table of n, a(n) for n = 1..316</a>

#6 by Max Alekseyev at Thu Jan 04 16:14:13 EST 2024

STATUS

editing

approved

Discussion

Thu Jan 04

16:14

OEIS Server: Installed first b-file as b366685.txt.

#5 by Max Alekseyev at Thu Jan 04 16:14:09 EST 2024

LINKS

Max Alekseyev, <a href="/A366685/b366685_1.txt">Table of n, a(n) for n = 1..316</a>

CROSSREFS

Cf. A024127, A000010, A295503, A366711, A366681, A366682, A366683, A366684.

STATUS

approved

editing

#4 by Michael De Vlieger at Mon Oct 16 16:11:56 EDT 2023

STATUS

proposed

approved

#3 by Sean A. Irvine at Mon Oct 16 14:54:42 EDT 2023

STATUS

editing

proposed

#2 by Sean A. Irvine at Mon Oct 16 14:38:52 EDT 2023

NAME

allocated for Sean A. Irvine

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

DATA

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

OFFSET

1,1

MATHEMATICA

EulerPhi[11^Range[30] - 1]

PROG

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

CROSSREFS

Cf. A024127, A000010, A295503.

KEYWORD

allocated

nonn

AUTHOR

Sean A. Irvine, Oct 16 2023

STATUS

approved

editing

#1 by Sean A. Irvine at Mon Oct 16 14:23:07 EDT 2023

NAME

allocated for Sean A. Irvine

KEYWORD

allocated

STATUS

approved