A112588 Numbers m such that phi(m) > 2*tau(m), where phi = A000010 and tau = A000005.

7, 11, 13, 17, 19, 21, 22, 23, 25, 26, 27, 29, 31, 32, 33, 34, 35, 37, 38, 39, 41, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 85, 86, 87, 88, 89, 91, 92, 93, 94, 95, 96

Offset

1,1

Comments

Complement of A112587.

Links

Table of n, a(n) for n=1..70.

Eric Weisstein's World of Mathematics, Totient Function

Eric Weisstein's World of Mathematics, Divisor Function

Formula

a(n) = n + 27 for n >= 94. - Jianing Song, Jul 28 2018

Mathematica

Select[Range[96], EulerPhi[#]>2DivisorSigma[0, #]&] (* James C. McMahon, Jun 04 2024 *)

Crossrefs

Cf. A000005, A000010, A112587.

Sequence in context: A103487 A175811 A373140 * A191988 A128974 A286609

Adjacent sequences: A112585 A112586 A112587 * A112589 A112590 A112591

Keyword

nonn

Author

Reinhard Zumkeller, Sep 14 2005

Status

approved