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 A090983 #6 Oct 19 2017 03:14:27 %S A090983 2,3,6,15,15,91,246,399,399,399,3045,3045,21099,41155,43059,182919, %T A090983 182919,182919,182919,860574,860574,8042479,8042479,11993466,11993466, %U A090983 11993466,78278655,78278655,78278655,78278655 %N A090983 a(n) is the least nonsquare having square residues modulo each of the first n primes. %Y A090983 Cf. A002189, A018883. %K A090983 nonn %O A090983 1,1 %A A090983 _Don Reble_, Feb 28 2004