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 A139502 #19 Sep 08 2022 08:45:33
%S A139502 241,409,601,769,1009,1129,1201,1249,1321,1489,1609,1801,2089,2161,
%T A139502 2281,2521,2689,3001,3049,3121,3169,3361,3529,3769,3889,4129,4201,
%U A139502 4441,4561,4729,4801,4969,5209,5281,5449,5521,5569,5641,5689,5881,6121,6361,6481
%N A139502 Primes of the form x^2 + 22x*y + y^2 for x and y nonnegative.
%C A139502 Also primes of the form x^2 + 120y^2. - _T. D. Noe_, Apr 29 2008
%C A139502 Also primes of the form x^2+240y^2. See A140633. - _T. D. Noe_, May 19 2008
%C A139502 In base 12, the sequence is 181, 2X1, 421, 541, 701, 7X1, 841, 881, 921, X41, E21, 1061, 1261, 1301, 13X1, 1561, 1681, 18X1, 1921, 1981, 1X01, 1E41, 2061, 2221, 2301, 2481, 2521, 26X1, 2781, 28X1, 2941, 2X61, 3021, 3081, 31X1, 3241, 3281, 3321, 3361, 34X1, 3661, 3821, 3901, where X is 10 and E is 11. Moreover, the discriminant is 340. - _Walter Kehowski_, Jun 01 2008
%H A139502 Vincenzo Librandi, <a href="/A139502/b139502.txt">Table of n, a(n) for n = 1..1000</a>
%H A139502 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)
%F A139502 The primes are congruent to {1, 49} (mod 120). - _T. D. Noe_, Apr 29 2008
%t A139502 QuadPrimes2[1, 0, 120, 10000] (* see A106856 *)
%o A139502 (Magma) [ p: p in PrimesUpTo(7000) | p mod 120 in {1, 49}]; // _Vincenzo Librandi_, Jul 28 2012
%Y A139502 Cf. A139489, A007645, A068228, A007519, A033212, A033212, A107152, A107008, A033215, A107145, A139490, A139491.
%Y A139502 Cf. A139643.
%K A139502 nonn,easy
%O A139502 1,1
%A A139502 _Artur Jasinski_, Apr 24 2008