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 A139897 #21 Sep 08 2022 08:45:34 %S A139897 3,83,107,227,347,443,467,563,587,683,827,947,1163,1187,1283,1307, %T A139897 1427,1523,1667,1787,1907,2003,2027,2243,2267,2843,2963,3083,3203, %U A139897 3323,3347,3467,3803,3923,3947,4283,4523,4547,4643,4787,5003,5147 %N A139897 Primes of the form 3*x^2+80*y^2. %C A139897 Discriminant=-960. See A139827 for more information. %C A139897 Except for 3, also primes of the form 27*x^2+24*x*y+32*y^2. See A140633. - _T. D. Noe_, May 19 2008 %C A139897 Excepting for the first term, 3, the members of this sequence seem to be terms of A123239 which are prime in k(i), k(rho) & k(sqrt(5)). [From _A.K. Devaraj_, Nov 30 2009] %H A139897 Vincenzo Librandi and Ray Chandler, <a href="/A139897/b139897.txt">Table of n, a(n) for n = 1..10000</a> [First 1000 terms from Vincenzo Librandi] %H A139897 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 A139897 Except for 3, primes congruent to 83 or 107 (mod 120). %t A139897 QuadPrimes2[3, 0, 80, 10000] (* see A106856 *) %o A139897 (Magma) [3] cat [p: p in PrimesUpTo(6000) | p mod 120 in [83, 107]]; // _Vincenzo Librandi_, Jul 31 2012 %K A139897 nonn,easy %O A139897 1,1 %A A139897 _T. D. Noe_, May 02 2008