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 A080567 #6 May 10 2013 12:45:10
%S A080567 1,3,7,15,47,111,367,879,2927,19311,52079,314223,1362799,3459951,
%T A080567 11848559,78957423,615828335,1689570159,10279504751,44639243119,
%U A080567 113358719855,663114533743,2862137789295,20454323833711,301929300544367
%N A080567 1 + Sum_{k=2..n} 2^((prime(k)-1)/2).
%C A080567 Take an initial segment of A080545, stopping at the n-th 1, reverse and interpret as a binary number.
%Y A080567 Cf. A080355, A080545.
%K A080567 nonn,easy
%O A080567 1,2
%A A080567 _N. J. A. Sloane_, based on information supplied by _Artur Jasinski_, Mar 21 2003
%E A080567 More terms from _Vladeta Jovovic_, Mar 26 2003