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 A121982 #23 Aug 28 2025 16:57:40 %S A121982 2,4,8,14,16,22,26,32,34,38,44,46,52,64,68,76,86,88,98,104,106,124, %T A121982 134,158,172,178,184,196,202,206,212,236,238,242,248,256,262,272,284, %U A121982 296,298,304,316,322,326,328,338,356,362,364,374,386,388,394,398,452,472 %N A121982 Numbers k such that k^2 + 15 is prime. %H A121982 G. C. Greubel, <a href="/A121982/b121982.txt">Table of n, a(n) for n = 1..5000</a> %e A121982 If k=104 then k^2 + 15 = 10831 (prime). %t A121982 Select[Range[200], PrimeQ[#1^2 + 15] &] (* _G. C. Greubel_, Sep 13 2017 *) %o A121982 (Magma) [n: n in [0..6000] | IsPrime(n^2 + 15)]; // _Vincenzo Librandi_, Nov 13 2010 %o A121982 (PARI) is(n)=isprime(n^2+15) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A121982 Cf. A005574, A067201, A049422, A007591, A078402, A114269, A114271, A114272, A114273, A114274, A114275, A113536, A121250. %K A121982 nonn,changed %O A121982 1,1 %A A121982 _Parthasarathy Nambi_, Sep 09 2006