A015832 Numbers k such that phi(k + 12) | sigma(k).

6, 14, 23, 24, 30, 33, 38, 51, 54, 60, 66, 78, 84, 87, 96, 102, 109, 120, 132, 141, 159, 168, 174, 204, 210, 246, 248, 249, 267, 276, 280, 321, 330, 345, 354, 372, 378, 380, 406, 411, 426, 495, 506, 519, 537, 564, 591, 606, 636, 642, 690, 699, 789, 822, 852

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..2000

Mathematica

Select[Range[3000], Divisible[DivisorSigma[1, #], EulerPhi[12 + #]] &] (* David Nacin, Mar 03 2012 *)

Crossrefs

Sequence in context: A079797 A093380 A123228 * A190753 A190740 A084583

Adjacent sequences: A015829 A015830 A015831 * A015833 A015834 A015835

Keyword

nonn

Author

Robert G. Wilson v

Status

approved