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 A177744 #4 Sep 08 2022 08:45:53 %S A177744 3,4,5,5,6,9,7,8,9,17,11,12,14,15,16,17,18,33,21,23,24,26,27,29,32,33, %T A177744 65,36,38,39,42,43,44,47,51,53,54,56,57,59,63,65,66,129,68,71,72,77, %U A177744 78,81,84,86,87,89,92,93,98,99,101,102,108,114,116,117,119,122,123,124,128 %N A177744 Number of conjugacy classes in PSL_2(q) as q runs through the primes and prime powers. %o A177744 (Magma) [ NumberOfClasses(PSL(2,q)):q in [2..251] | IsPrimePower(q) ]; %Y A177744 q = A000961(n+1). %Y A177744 This is the row length sequence for A060247. %Y A177744 Cf. A124678. %K A177744 easy,nonn %O A177744 1,1 %A A177744 _Jason Kimberley_, May 22 2010