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 A140615 #22 Aug 11 2014 22:45:39 %S A140615 13,61,109,277,349,373,541,613,733,853,877,997,1069,1117,1381,1429, %T A140615 1597,1669,1693,1789,1861,1933,2053,2221,2389,2437,2749,2917,3109, %U A140615 3181,3229,3253,3373,3517,3541,3637,3709,4021,4549,4597,4813,4861 %N A140615 Primes of the form 13x^2+6xy+21y^2. %C A140615 Discriminant=-1056. Also primes of the form 13x^2+2xy+61y^2. %C A140615 In base 12, the sequence is 11, 51, 91, 1E1, 251, 271, 391, 431, 511, 5E1, 611, 6E1, 751, 791, 971, 9E1, E11, E71, E91, 1051, 10E1, 1151, 1231, 1351, 1471, 14E1, 1711, 1831, 1971, 1X11, 1X51, 1X71, 1E51, 2051, 2071, 2131, 2191, 23E1, 2771, 27E1, 2951, 2991, where X is 10 and E is 11. Moreover, the discriminant is -740. - _Walter Kehowski_, May 31 2008 %H A140615 Vincenzo Librandi and Ray Chandler, <a href="/A140615/b140615.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A140615 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 A140615 Union[QuadPrimes2[13, 6, 21, 10000], QuadPrimes2[13, -6, 21, 10000]] (* see A106856 *) %Y A140615 Cf. A140633. %K A140615 nonn,easy %O A140615 1,1 %A A140615 _T. D. Noe_, May 19 2008