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 A115434 #5 Jul 15 2021 06:22:04 %S A115434 8,16,1337032,2084503,2953232,4023943,1330033613070195328, %T A115434 4036108433661798551,8283744867954114232, %U A115434 6247320195351414276186411625291,9452080202814205132771066881607 %N A115434 Numbers k such that the concatenation of k with k-7 gives a square. %e A115434 4023943_4023936 = 6343456^2. %Y A115434 Cf. A030465, A102567, A115426, A115437, A115428, A115429, A115430, A115431, A115432, A115433, A115435, A115436, A115445. %K A115434 base,nonn %O A115434 1,1 %A A115434 _Giovanni Resta_, Jan 25 2006