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 A249435 #11 Aug 26 2015 12:57:29 %S A249435 0,3,7,8,15,24,26,31,48,63,80,120,124,127,168,242,255,288,342,360,511, %T A249435 528,624,728,840,960,1023,1330,1368,1680,1848,2047,2186,2196,2208, %U A249435 2400,2808,3124,3480,3720,4095,4488,4912,5040,5328,6240,6560,6858,6888,7920,8191,9408,10200,10608,11448 %N A249435 a(1) = 0, after which one less than prime powers p^m with exponent m >= 2. %H A249435 Charles R Greathouse IV, <a href="/A249435/b249435.txt">Table of n, a(n) for n = 1..10000</a> %F A249435 a(n) = A025475(n) - 1. %o A249435 (Scheme) (define (A249435 n) (- (A025475 n) 1)) %o A249435 (PARI) list(lim)=my(v=List([0])); lim=lim\1+1; for(m=2,logint(lim,2), forprime(p=2,sqrtnint(lim,m), listput(v, p^m-1))); Set(v) \\ _Charles R Greathouse IV_, Aug 26 2015 %Y A249435 One less than A025475. %Y A249435 Subsequence of A181062 and also a subsequence of A249433 (after the initial zero). %Y A249435 Union of sequences A000225, A024023, A024049, A024075, A024127, etc. without their term a(1). %Y A249435 Apart from the first term, subsequence of A045542. %K A249435 nonn %O A249435 1,2 %A A249435 _Antti Karttunen_, Nov 02 2014