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 A066948 #3 Mar 31 2012 13:50:43 %S A066948 0,1,1,1,5,1,6,2,1,13,5,1,18,7,2,1,36,11,3,1,48,20,5,2,79,28,9,3,109, %T A066948 42,13,5,1,170,64,19,7,1,230,90,28,11,2,1,337,127,40,17,3,1,453,181, %U A066948 58,24,5,2,648,247,80,34,7,3,859,338,111,48,11,5,1,1185,465,151,66,15,7,1 %N A066948 Triangle of prime signature of A007870(n), read by rows. %C A066948 Lengths of rows are 1 2 2 3 3 4 4 4 4 5 5 6 6 .... (A000720). %e A066948 0.1.1.5.6.13.18.36.48.79...etc %e A066948 ....1.1.2..5..7.11.20.28...etc %e A066948 ........1..1..2..3..5..9...etc %e A066948 ..............1..1..2..3...etc %K A066948 easy,nonn,tabf %O A066948 1,5 %A A066948 _Naohiro Nomoto_, Jan 25 2002 %E A066948 Extended by _David Wasserman_, Dec 04 2002