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 A204920 #11 Sep 20 2018 00:30:00 %S A204920 5,16,21,16,5,24,21,16,45,40,165,24,117,112,45,16,357,72,285,40,21, %T A204920 264,552,24,525,312,837,112,957,120,837,96,165,408,280,72,888,912,117, %U A204920 40,1845,168,1677,264,45,552,1128,96,2205,600,357,312,1272,432 %N A204920 a(n) = p(n)^2 - q(n)^2, where (p(n)^2, q(n)^2) is the least pair of squared primes for which n divides p(n)^2 - q(n)^2. %C A204920 For a guide to related sequences, see A204892. %t A204920 (See the program at A204908.) %Y A204920 Cf. A204908, A204900, A204892. %K A204920 nonn %O A204920 1,1 %A A204920 _Clark Kimberling_, Jan 20 2012