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 A375463 #21 Aug 18 2024 09:05:37 %S A375463 221,325,377,425,493,629,697,725,925,1025,1073,1189,1325,1517,1537, %T A375463 1769,1885,1961,2173,2257,2405,2501,2665,2701,2993,3145,3233,3293, %U A375463 3445,3485,3649,3869,3965,3977,4453,4505,4717,4745,5141,5185,5353,5429,5777,5785,5917 %N A375463 Numbers appearing on all three positions in ordered primitive Pythagorean triples. %H A375463 Mathematics Stack Exchange, <a href="https://math.stackexchange.com/questions/4958438/is-there-an-integer-that-serves-as-the-short-leg-of-a-primitive-pythagorean-trip">Is there an integer that serves as the short leg of a primitive Pythagorean triple, the long leg of another, and the hypotenuse of a third?</a> %H A375463 Rémy Sigrist, <a href="/A375463/a375463.gp.txt">PARI program</a> %F A375463 a(n) == 1 (mod 4). - _Hugo Pfoertner_, Aug 18 2024 %e A375463 221 is a term since the following primitive Pythagorean triples have 221 in first, second and third position: (221, 24420, 24421), (60, 221, 229), (21, 220, 221). %o A375463 (PARI) \\ See Links section. %Y A375463 Intersection of A008846, A024352 and A024354. %Y A375463 Cf. A263728. %K A375463 nonn %O A375463 1,1 %A A375463 _Piotr Lipski_, Aug 16 2024 %E A375463 More terms from _Rémy Sigrist_, Aug 17 2024