A015773 Numbers k such that phi(k) | sigma_14(k).

1, 2, 3, 6, 22, 33, 66, 118, 177, 354, 454, 750, 1298, 1362, 1372, 1947, 3894, 4116, 4994, 8706, 14982, 15092, 26786, 33906, 44250, 45276, 56750, 65542, 77858, 80358, 98961, 116787, 170250, 171500, 196626, 197922, 233574, 242844

Offset: 1

Author

Robert G. Wilson v

Keywords

• nonn

Comments

sigma_14(k) is the sum of the 14th powers of the divisors of k.

Links

• Amiram Eldar, Table of n, a(n) for n = 1..360

Crossrefs

Cf. A000010, A013962.

Cf. A020492, A015759, A015761, A015762, A015763, A015764, A015765, A015766, A015767, A015768, A015769, A015770, A015771, A015774, A094470.

Programs

Mathematica

Select[Range[250000],Divisible[DivisorSigma[14,#],EulerPhi[#]]&] (* Harvey P. Dale, Feb 02 2019 *)