cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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

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%I A168146 #13 Jul 15 2016 08:27:51
%S A168146 1,5,7,9,11,13,15,16,17,19,21,22,23,25,26,27,28,29,31,32,33,34,35,36,
%T A168146 37,38,39,40,41,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,61,
%U A168146 62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85
%N A168146 Numbers n such that phi(n) > pi(n).
%C A168146 Numbers n such that A000010(n) > A000720(n).
%H A168146 G. C. Greubel, <a href="/A168146/b168146.txt">Table of n, a(n) for n = 1..1000</a>
%F A168146 A000010(a(n)) > A000720(a(n)).
%F A168146 A000027 \ A037229. - _R. J. Mathar_, Nov 19 2009
%e A168146 A000010(a(1)=1)=1>A000720(a(1)=1)=0; A000010(a(2)=5)=4>A000720(a(2)=5)=3.
%t A168146 Select[Range[100],EulerPhi[#]>PrimePi[#]&] (* _Harvey P. Dale_, Jun 03 2016 *)
%Y A168146 Cf. A000010, A000720, A037121, A037228, A037229 (complement), A073456.
%K A168146 nonn
%O A168146 1,2
%A A168146 _Juri-Stepan Gerasimov_, Nov 19 2009
%E A168146 More terms from _R. J. Mathar_, Nov 19 2009