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 A140621 #20 Aug 05 2014 14:16:32 %S A140621 73,97,193,457,577,1033,1657,1753,2017,2113,2137,2377,2593,2953,3217, %T A140621 3313,3673,3697,4153,4297,4513,5233,5857,6073,6337,6793,7057,7417, %U A140621 7753,7873,7993,8353,8377,9433,9817,10177,10753,10993,11113,11497 %N A140621 Primes of the form 28x^2+12xy+57y^2. %C A140621 Discriminant=-6240. Also primes of the form 72x^2+48xy+73y^2. %C A140621 In base 12, the sequence is 61, 81, 141, 321, 401, 721, E61, 1021, 1201, 1281, 12X1, 1461, 1601, 1861, 1X41, 1E01, 2161, 2181, 24X1, 25X1, 2741, 3041, 3481, 3621, 3801, 3E21, 4101, 4361, 45X1, 4681, 4761, 4X01, 4X21, 5561, 5821, 5X81, 6281, 6441, 6521, 67X1, where X is for 10 and E is for 11. Moreover, the discriminant is -3740. - _Walter Kehowski_, Jun 01 2008 %H A140621 Vincenzo Librandi and Ray Chandler, <a href="/A140621/b140621.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A140621 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) %t A140621 Union[QuadPrimes2[28, 12, 57, 10000], QuadPrimes2[28, -12, 57, 10000]] (* see A106856 *) %Y A140621 Cf. A140633. %K A140621 nonn,easy %O A140621 1,1 %A A140621 _T. D. Noe_, May 19 2008