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 A145048 #5 Jan 12 2020 23:45:54 %S A145048 2749,2897,3049,3529,3557,3929,4073,4253,4657,4817,5081,5281,5417, %T A145048 5449,5657,5693,5869,6053,6121,6529,6793,6833,7109,7393,7541,7829, %U A145048 7877,7993,8209,8329,8377,8429,8501,8741,8761,8893,9001,9109,9157,9209,9257,9293 %N A145048 Primes p of the form 4k+1 for which s=13 is the least positive integer such that sp-(floor(sqrt(sp)))^2 is a square. %e A145048 a(1)=2749 since p=2749 is the least prime of the form 4k+1 for which sp-(floor(sqrt(sp)))^2 is not a square for s=1..12, but 13p-(floor(sqrt(13p)))^2 is a square (for p=2749 it is 16). %Y A145048 Cf. A145016, A145022, A145023, A145047. %K A145048 nonn %O A145048 1,1 %A A145048 _Vladimir Shevelev_, Sep 30 2008