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 A097102 #21 Dec 30 2019 10:14:26
%S A097102 1105,1885,2210,2405,2465,2665,3145,3315,3445,3485,3770,3965,4420,
%T A097102 4505,4745,4810,4930,5185,5330,5365,5655,5785,5945,6205,6290,6305,
%U A097102 6409,6565,6630,6890,6970,7085,7215,7345,7395,7540,7565,7585,7685,7735,7930,7995
%N A097102 Numbers n that are the hypotenuse of exactly 13 distinct integer-sided right triangles, i.e., n^2 can be written as a sum of two squares in 13 ways.
%C A097102 If m is a term, then 2*m and p*m are terms where p is any prime of the form 4k+3. - _Ray Chandler_, Dec 30 2019
%H A097102 Chai Wah Wu, <a href="/A097102/b097102.txt">Table of n, a(n) for n = 1..10000</a>
%t A097102 r[a_]:={b, c}/.{ToRules[Reduce[0<b<c&&a^2 == b^2 + c^2, {b, c}, Integers]]}; Select[Range[5000], Length[r[#]] == 13 &] (* _Vincenzo Librandi_, Mar 01 2016 *)
%Y A097102 Cf. A004144 (0), A084645 (1), A084646 (2), A084647 (3), A084648 (4), A084649 (5), A097219 (6), A097101 (7), A290499 (8), A290500 (9), A097225 (10), A290501 (11), A097226 (12), A290502 (14), A290503 (15), A097238 (16), A097239 (17), A290504 (18), A290505 (19), A097103 (22), A097244 (31), A097245 (37), A097282 (40), A097626 (67).
%K A097102 nonn
%O A097102 1,1
%A A097102 _James R. Buddenhagen_, Sep 15 2004
%E A097102 More terms from _Ray Chandler_, Sep 16 2004
%E A097102 Definition corrected by _Zak Seidov_, Feb 26 2008