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 A248215 #6 Oct 09 2014 16:48:36
%S A248215 13,17,29,1,9,49,9,1,17,25,25,49,9,17,1,25,9,25,17,1,49,29,17,29,49,1,
%T A248215 25,29,17,29,49,25,49,1,17,9,25,9,29,1,17,25,9,49,17,1,29,49,1,9,29,
%U A248215 25,29,49,25,49,1,9,25,29,17,25,9,1,17,29,9,25,49,17,1,25,1,9,49,9,29,29,1,9,1,17
%N A248215 Primes of form x^2+13*y^2 (mod 52).
%C A248215 Primes of form x^2+13*y^2 are congruent to {1, 9, 13, 17, 25, 29, or 49} (mod 52). Among first 10000 such primes (A033210), the corresponding frequences are: 1664, 1665, 1, 1667, 1661, 1666, 1676 - remarkably uniform distribution except for prime 13.
%Y A248215 Cf. A033210.
%K A248215 nonn
%O A248215 1,1
%A A248215 _Zak Seidov_, Oct 04 2014