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 A071243 #6 Mar 14 2015 01:58:21
%S A071243 1,2,4,6,16,64,1024,4096,65536,262144,4194304,268435456,1073741824,
%T A071243 68719476736,1099511627776,4398046511104,70368744177664,
%U A071243 4503599627370496,288230376151711744,1152921504606846976
%N A071243 Record terms in A005179.
%C A071243 The only term that is not a power of 2 is the 4th term 6.
%C A071243 Essentially the same as A061286 with terms {1,6} added.
%F A071243 For n>2, a(n+2) = A061286(n) = 2^(A000040(n)-1) = 2^A006093(n).
%Y A071243 Cf. A005179.
%K A071243 nonn
%O A071243 1,2
%A A071243 _Amarnath Murthy_, May 20 2002
%E A071243 Edited, corrected and extended by _Ray Chandler_, Jun 28 2008