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 A074235 #13 Jan 29 2024 19:12:20 %S A074235 1,2,3,5,6,7,9,10,11,13,14,17,18,19,22,23,25,26,27,29,31,33,34,37,38, %T A074235 39,41,43,46,47,49,50,51,53,54,57,58,59,61,62,65,66,67,69,71,73,74,78, %U A074235 79,81,82,83,85,86,87,89,93,94,95,97,98,101,102,103,106,107,109,111 %N A074235 Numbers that cannot be a long leg of an integer right triangle. %C A074235 The possible values of a long leg of an integer right triangle are in A009012. %C A074235 A227481(a(n)) = 1. - _Reinhard Zumkeller_, Oct 11 2013 %H A074235 Reinhard Zumkeller, <a href="/A074235/b074235.txt">Table of n, a(n) for n = 1..1000</a> %e A074235 5 is a term because a^2 + 5^2 = c^2 has no solution for a < 5 with integers a, c. %e A074235 13 is a term because a^2 + 13^2 = c^2 has no solution for a < 13 with integers a, c. %o A074235 (Haskell) %o A074235 a074235 n = a074235_list !! (n-1) %o A074235 a074235_list = filter ((== 1) . a227481) [1..] %o A074235 -- _Reinhard Zumkeller_, Oct 11 2013 %Y A074235 Cf. A009012. %Y A074235 Cf. A009023 (complement). %K A074235 nonn %O A074235 1,2 %A A074235 _Zak Seidov_, Sep 18 2002