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A015799 phi(n) + 8 | sigma(n). 1
22, 44, 60, 84, 120, 132, 135, 140, 156, 204, 228, 231, 270, 276, 348, 372, 375, 444, 462, 492, 496, 516, 525, 532, 564, 636, 660, 700, 708, 726, 732, 750, 756, 804, 852, 876, 920, 935, 948, 996, 1050, 1068, 1164, 1212, 1236, 1248, 1284 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..47.

MATHEMATICA

Select[Range[2000], Divisible[DivisorSigma[1, #], EulerPhi[#]+8]&] (* Harvey P. Dale, Dec 04 2021 *)

PROG

(PARI) is(n)=!(sigma(n)%eulerphi(n+8)) \\ Charles R Greathouse IV, Sep 25 2012

CROSSREFS

Sequence in context: A138842 A040462 A269310 * A008604 A110724 A277051

Adjacent sequences:  A015796 A015797 A015798 * A015800 A015801 A015802

KEYWORD

nonn

AUTHOR

Robert G. Wilson v

STATUS

approved

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Last modified August 12 00:34 EDT 2022. Contains 356067 sequences. (Running on oeis4.)