A168146 Numbers n such that phi(n) > pi(n).

1, 5, 7, 9, 11, 13, 15, 16, 17, 19, 21, 22, 23, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85

Offset

1,2

Comments

Numbers n such that A000010(n) > A000720(n).

Links

G. C. Greubel, Table of n, a(n) for n = 1..1000

Formula

A000010(a(n)) > A000720(a(n)).

A000027 \ A037229. - R. J. Mathar, Nov 19 2009

Example

A000010(a(1)=1)=1>A000720(a(1)=1)=0; A000010(a(2)=5)=4>A000720(a(2)=5)=3.

Mathematica

Select[Range[100], EulerPhi[#]>PrimePi[#]&] (* Harvey P. Dale, Jun 03 2016 *)

Crossrefs

Cf. A000010, A000720, A037121, A037228, A037229 (complement), A073456.

Sequence in context: A128163 A177088 A362486 * A343064 A106505 A097985

Adjacent sequences: A168143 A168144 A168145 * A168147 A168148 A168149

Keyword

nonn

Author

Juri-Stepan Gerasimov, Nov 19 2009

Extensions

More terms from R. J. Mathar, Nov 19 2009

Status

approved