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A055706 Numbers n such that n | sigma_12(n) + phi(n)^12. 0
1, 2, 6, 84, 437, 1366, 2390, 5676, 47471, 75972, 82321, 99012, 3015760, 5667660, 7881348, 11498604, 26118614, 26447827, 114092460, 115426140, 121197447, 207767052, 257342460, 463216428, 567155020, 658286388, 758280060, 1013513752, 1261438248, 1762803253 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

sigma_12(n) is the sum of the 12th powers of the divisors of n (A013960).

LINKS

Table of n, a(n) for n=1..30.

MATHEMATICA

Do[If[Mod[DivisorSigma[12, n]+EulerPhi[n]^12, n]==0, Print[n]], {n, 1, 10^5}]

PROG

(PARI) isok(n) = !((sigma(n, 12) + eulerphi(n)^12) % n); \\ Michel Marcus, Mar 02 2014

CROSSREFS

Sequence in context: A244084 A245463 A325949 * A118537 A109892 A268534

Adjacent sequences:  A055703 A055704 A055705 * A055707 A055708 A055709

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Jun 09 2000

EXTENSIONS

More terms from Michel Marcus, Mar 02 2014

STATUS

approved

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Last modified November 18 22:39 EST 2019. Contains 329305 sequences. (Running on oeis4.)