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 A243174 #18 Jun 03 2022 18:08:45 %S A243174 0,1,4,9,16,19,25,31,36,45,49,55,61,64,76,79,81,99,100,109,121,124, %T A243174 139,144,145,151,169,171,180,181,196,199,205,211,220,225,229,241,244, %U A243174 256,261,271,279,289,295,304,316,319,324,331,349,355,361,369,379,396,400,405,409,421,436,439,441,445,451,475,484,495,496,499,505,529,531,541,549 %N A243174 Nonnegative integers of the form x^2 + 5*x*y - 5*y^2 (discriminant 45). %C A243174 Also numbers representable as x^2 + 7*x*y + y^2 with 0 <= x <= y. - _Gheorghe Coserea_, Jul 29 2018 %C A243174 Also numbers of the form x^2 - x*y - 11*y^2 with 0 <= x <= y (or x^2 + x*y - 11*y^2 with x, y nonnegative). - _Jianing Song_, Jul 31 2018 %C A243174 Also nonnegative integers of the form 9x^2 - 5y^2. - _Jon E. Schoenfield_, Jun 03 2022 %H A243174 Gheorghe Coserea, <a href="/A243174/b243174.txt">Table of n, a(n) for n = 1..100001</a> %H A243174 N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references) %Y A243174 Cf. A028957, A031363. %Y A243174 Primes: A033212. %K A243174 nonn %O A243174 1,3 %A A243174 _N. J. A. Sloane_, Jun 01 2014