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 A102444 #5 Mar 30 2012 18:50:48 %S A102444 1,5,11,23,47,149,359,719,1439,2879,12097,24197,48407,96821,193649, %T A102444 968237,2614327,5809201,11618413,25055857,75167579,225502703, %U A102444 451005407,2109888899,4510054327,14500925539,43502776619,87005553241,174011106487 %N A102444 Smallest number m such that A102442(m)=n. %C A102444 Primes: a(n+1) > 2*a(n). %Y A102444 Cf. A102440. %Y A102444 A056637 describes another iteration that reduces primes to 2 and 3. %K A102444 nonn %O A102444 1,2 %A A102444 _Reinhard Zumkeller_, Jan 09 2005 %E A102444 More terms from _David Wasserman_, Apr 04 2008