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 A320757 #30 Feb 16 2025 08:33:56 %S A320757 2,3,3,4,4,5,5,5,5,5,6,5,6,7,7,7,7,8,7,7,8,9,7,7,7,8,8,7,8,8,9,9,9,9, %T A320757 8,9,9,9,9,9,11,9,11,11,9,9,11,11,9,10,11,11,12,11,11,11,11,11,11,10, %U A320757 10,11 %N A320757 For p the n-th prime congruent to 1 (mod 4), a(n) is the clique number of the quadratic residue (Paley) graph over F_p, the field of order p. %H A320757 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CliqueNumber.html">Clique Number</a> %H A320757 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PaleyGraph.html">Paley Graph</a> %e A320757 a(1) = 2, since the Paley graph of order 5 is a 5-cycle, and contains no triangle. %Y A320757 Cf. A002144 (primes of form 4n + 1), A320837. %K A320757 nonn,more %O A320757 1,1 %A A320757 _Jeremy F. Alm_, Oct 20 2018