This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A055704 Numbers n such that n | sigma_10(n) + phi(n)^10. 0
 1, 2, 6, 38, 551, 589, 750, 2510, 3277, 7801, 9940, 11359, 16810, 19875, 21250, 23700, 30450, 33000, 34350, 41005, 117670, 132300, 144300, 145150, 161700, 234635, 242550, 249000, 308700, 365750, 407925, 423801, 437250, 468150, 524700, 577850, 585206, 616585 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS sigma_10(n) is the sum of the 10th powers of the divisors of n (A013958). LINKS MATHEMATICA Do[If[Mod[DivisorSigma[10, n]+EulerPhi[n]^10, n]==0, Print[n]], {n, 1, 10^5}] PROG (PARI) isok(n) = !((sigma(n, 10) + eulerphi(n)^10) % n); \\ Michel Marcus, Mar 02 2014 CROSSREFS Sequence in context: A002031 A184731 A005738 * A005740 A006536 A057297 Adjacent sequences:  A055701 A055702 A055703 * A055705 A055706 A055707 KEYWORD nonn AUTHOR Robert G. Wilson v, Jun 09 2000 EXTENSIONS More terms from Michel Marcus, Mar 02 2014 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 14 07:31 EDT 2019. Contains 327995 sequences. (Running on oeis4.)