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 A078832 #7 Jul 17 2015 05:58:18 %S A078832 1,2,3,2,2,2,3,2,2,2,2,2,2,2,3,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,2,2,2, %T A078832 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,2,2,2,2,2, %U A078832 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2 %N A078832 Smallest prime contained as binary substring in binary representation of n>1, a(1)=1. %C A078832 a(n)<=3 and for n>1: a(n)>=2 and a(n)=3 iff n=2^k-1, k>1. %C A078832 a(n) = A225243(n,1). - _Reinhard Zumkeller_, Aug 14 2013 %H A078832 Reinhard Zumkeller, <a href="/A078832/b078832.txt">Table of n, a(n) for n = 1..10000</a> %F A078832 For n > 1: a(n) = A036987(n) + 2. _Reinhard Zumkeller_, Aug 14 2013 %o A078832 (Haskell) %o A078832 a078832 = head . a225243_row -- _Reinhard Zumkeller_, Aug 14 2013 %Y A078832 Cf. A078833, A078826, A078822, A007088, A020639. %Y A078832 Cf. A030308, A010051, A000225. %K A078832 nonn,base %O A078832 1,2 %A A078832 _Reinhard Zumkeller_, Dec 08 2002