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 A335778 #14 Jul 05 2020 12:24:06
%S A335778 12,12,24,36,60,84,84,132,96,372,144,408,168,180,732,468,348,1032,408,
%T A335778 1392,528,1704,612,1956,948,744,2316,1092,816,1212,1236,2724,912,2616,
%U A335778 2820,948,1092,1548,1188,1200,1716
%N A335778 The square roots of the perfect squares produced by A335410 in the order in which they appear.
%e A335778 11 is in sequence A335410. 2*(11^2 - 7^2) = 144 = 12^2. Therefore, 12 is in this sequence.
%t A335778 Select[IntegerQ][Table[Sqrt[2*Prime[n]^2 - 2*Prime[n-1]^2], {n,17000}]]
%o A335778 (PARI) lista(nn) = {my(pp=2, s); forprime (p=3, nn, if (issquare(s=2*(p^2 - pp^2)), print1(sqrtint(s), ", ")); pp = p;);} \\ _Michel Marcus_, Jun 25 2020
%Y A335778 Cf. A335410.
%K A335778 nonn
%O A335778 1,1
%A A335778 _Jeff Brown_, Jun 22 2020