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 A238246 #5 Feb 20 2014 15:38:58 %S A238246 3,5,6,7,9,10,12,13,14,15,17,18,20,24,25,26,28,29,30,31,33,34,36,40, %T A238246 48,49,50,52,56,57,58,60,61,62,63,65,66,68,72,80,96,97,98,100,104,112, %U A238246 113,114,116,120,121,122,124,125,126,127,129,130,132,136,144 %N A238246 Numbers m such that A072219(m) = 3. %C A238246 a(n) = A043687(n) + 1. %H A238246 Reinhard Zumkeller, <a href="/A238246/b238246.txt">Table of n, a(n) for n = 1..1000</a> %o A238246 (Haskell) %o A238246 a238246 n = a238246_list !! (n-1) %o A238246 a238246_list = filter ((== 3) . a072219) [1..] %Y A238246 Cf. A000079, A238247, A238248. %K A238246 nonn %O A238246 1,1 %A A238246 _Reinhard Zumkeller_, Feb 20 2014