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 A140619 #22 Aug 05 2014 14:16:31 %S A140619 19,43,139,211,283,307,523,547,571,739,787,811,1051,1459,1531,1579, %T A140619 1627,1723,1867,1987,2131,2251,2371,2659,2683,2851,3163,3187,3307, %U A140619 3571,3643,3691,3739,3907,4003,4099,4219,4243,4363,4483,4507,5011 %N A140619 Primes of the form 19x^2+4xy+28y^2. %C A140619 Discriminant=-2112. Also primes of the form 19x^2+10xy+43y^2. %C A140619 In base 12, the sequence is 17, 37, E7, 157, 1E7, 217, 377, 397, 3E7, 517, 557, 577, 737, X17, X77, XE7, E37, EE7, 10E7, 1197, 1297, 1377, 1457, 1657, 1677, 1797, 19E7, 1X17, 1XE7, 2097, 2137, 2177, 21E7, 2317, 2397, 2457, 2537, 2557, 2637, 2717, 2737, 2X97, where X is for 10 and E is for 11. Moreover, the discriminant is -1280. - _Walter Kehowski_, Jun 01 2008 %H A140619 Vincenzo Librandi and Ray Chandler, <a href="/A140619/b140619.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A140619 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 A140619 Union[QuadPrimes2[19, 4, 28, 10000], QuadPrimes2[19, -4, 28, 10000]] (* see A106856 *) %Y A140619 Cf. A140633. %K A140619 nonn,easy %O A140619 1,1 %A A140619 _T. D. Noe_, May 19 2008