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A344994 Numbers k such that A173557(k) divides nonzero A051709(k). 3
4, 6, 8, 12, 16, 24, 27, 28, 32, 42, 48, 54, 60, 64, 96, 108, 112, 120, 126, 128, 150, 168, 176, 192, 204, 216, 240, 243, 250, 256, 294, 312, 378, 384, 396, 432, 440, 448, 456, 460, 480, 486, 496, 500, 504, 512, 540, 588, 672, 700, 768, 774, 828, 840, 864, 888, 924, 960, 972, 1000, 1014, 1024, 1080, 1134, 1176, 1216 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..66.

PROG

(PARI)

A051709(n) = ((sigma(n) + eulerphi(n)) - (2*n));

A173557(n) = factorback(apply(p -> p-1, factor(n)[, 1]));

isA344994(n) = { my(u=A051709(n)); ((u>0)&&(0==(u%A173557(n)))); };

CROSSREFS

Cf. A051709, A173557.

Cf. A344995, A345054 (subsequences).

Cf. also A344754, A345051.

Sequence in context: A020225 A310663 A162294 * A211026 A090989 A161219

Adjacent sequences:  A344991 A344992 A344993 * A344995 A344996 A344997

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jun 05 2021

STATUS

approved

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Last modified October 21 21:51 EDT 2021. Contains 348155 sequences. (Running on oeis4.)