login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A055707 Numbers n such that n | Sigma_13(n) + Phi(n)^13. 0
1, 2, 12, 34, 42, 90, 170, 198, 402, 434, 456, 482, 494, 2046, 4086, 4518, 7520, 7605, 8622, 9632, 10924, 28280, 51570, 51714, 74124, 77724 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

sigma_13(n) is the sum of the 13th powers of the divisors of n.

MATHEMATICA

Do[If[Mod[DivisorSigma[13, n]+EulerPhi[n]^13, n]==0, Print[n]], {n, 1, 10^5}]

CROSSREFS

Sequence in context: A133577 A106185 A098203 * A055699 A062094 A200543

Adjacent sequences:  A055704 A055705 A055706 * A055708 A055709 A055710

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 09 2000

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 02:58 EST 2012. Contains 205567 sequences.