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.
%I A144761 #3 Mar 31 2012 10:28:53 %S A144761 4,6,10,12,18,24,30,36,42,54,60,78,84,90,120,150,168,180,210,240,270, %T A144761 300,330,390,420,510,546,570,630,780,840,990,1050,1170,1260,1320,1470, %U A144761 1650,1680,1890,2100,2310,2730,3150,3360,3570,3990,4290,4620,4830 %N A144761 Integers n such that Phi(2, a(n)) = A144741(a(n)) > Phi(2, k) for 0 < k < a(n). %C A144761 Subset of A065385. %C A144761 The first three terms are semiprimes and the number of factors gradually increases. All except four and ten are multiples of six. %Y A144761 Cf. A051953, A065385, A144741, A144742 %K A144761 easy,nonn %O A144761 1,1 %A A144761 _Reikku Kulon_, Sep 20 2008