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 A121817 #11 Jun 08 2025 01:12:06 %S A121817 0,2,4,5,7,12,14,15,27,30,32,34,40,47,49,50,57,60,62,67,72,75,82,85, %T A121817 89,95,97,102,104,105,109,110,119,135,140,162,175,177,180,182,187,189, %U A121817 194,200,214,219,222,225,235,239,242,244,247,254,257,259,265,277,279,280 %N A121817 Numbers m such that 23 + 36*m*(m+1) is prime. %C A121817 All terms of A121250 (numbers n such that n^2+14 is prime) are of the form n = 3+6*m, m = 0, 1, .... Hence n^2 + 14 = 23 + 36*m(m+1): these values of m are in this sequence. %t A121817 Select[Range[0,300], PrimeQ[23 + 36*#(1+#) ]&] %o A121817 (PARI) select( is_A121817(n)=isprime(23+36*(n+1)*n), [0..299]) \\ _M. F. Hasler_, May 25 2019 %Y A121817 Cf. A121250. %K A121817 nonn %O A121817 1,2 %A A121817 _Zak Seidov_, Sep 09 2006 %E A121817 Edited by _M. F. Hasler_, May 25 2019