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 A138077 #42 Apr 05 2022 21:04:08 %S A138077 7,13,21,31,57,73,91,133 %N A138077 Index of the largest maximal subgroup of PSL(3,q) as q runs through the prime powers (A000961). %C A138077 First eight entries agree with the ATLAS. - _Eric M. Schmidt_, Apr 21 2013 %C A138077 Is this sequence simply A335865 starting with the second term? - _Max Alekseyev_, Apr 04 2022 %o A138077 (Sage) def a138077_q(q): G = PSL(3,q); d = G.order(); return d // max(H.order() for H in G.conjugacy_classes_subgroups() if H.order()<d) # _Max Alekseyev_, Apr 05 2022 %Y A138077 Cf. A000961, A003807 (order of PSL(3,q)), A335865. %K A138077 nonn,hard,more %O A138077 1,1 %A A138077 _John Cannon_ and _N. J. A. Sloane_, Dec 06 2009 %E A138077 a(3) corrected by _Eric M. Schmidt_, Apr 20 2013 %E A138077 Unconfirmed terms from a(9) onward removed by _Max Alekseyev_, Apr 05 2022