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 A140622 #20 Aug 05 2014 14:16:32 %S A140622 109,229,349,421,541,661,709,1021,1549,1669,1789,1861,2221,2269,2749, %T A140622 3061,3109,3229,3469,3541,4621,4789,4909,5101,5701,5869,6229,6469, %U A140622 6661,6781,6949,7741,7789,8101,8221,8461,8821,9349,9661,9781,9901 %N A140622 Primes of the form 21x^2+12xy+76y^2. %C A140622 Discriminant=-6240. Also primes of the form 45x^2+30xy+109y^2. %C A140622 In base 12, the sequence is 91, 171, 251, 2E1, 391, 471, 4E1, 711, X91, E71, 1051, 10E1, 1351, 1391, 1711, 1931, 1971, 1X51, 2011, 2071, 2811, 2931, 2X11, 2E51, 3371, 3491, 3731, 38E1, 3X31, 3E11, 4031, 4591, 4611, 4831, 4911, 4X91, 5131, 54E1, 5711, 57E1, 5891, where X is for 10 and E is for 11. Moreover, the discriminant is -3740. - _Walter Kehowski_, Jun 01 2008 %H A140622 Vincenzo Librandi and Ray Chandler, <a href="/A140622/b140622.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A140622 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 A140622 Union[QuadPrimes2[21, 12, 76, 10000], QuadPrimes2[21, -12, 76, 10000]] (* see A106856 *) %Y A140622 Cf. A140633. %K A140622 nonn,easy %O A140622 1,1 %A A140622 _T. D. Noe_, May 19 2008