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 A262772 #15 Aug 21 2025 18:51:47 %S A262772 7,45,67,145,411,825,1021,4039,9069,9789,12463,15137,26313,27499 %N A262772 Numbers k such that k!! - 32 is prime. %C A262772 Corresponding primes are 73, 25373791335626257947657609343, ... . %C A262772 a(15) > 50000. %H A262772 Joe McLean, <a href="http://web.archive.org/web/20091027034731/http://uk.geocities.com/nassarawa%40btinternet.com/probprim2.htm">Interesting Sources of Probable Primes</a> %t A262772 Select[Range[0, 50000], If[#!! - 32 > 0, PrimeQ[#!! - 32]] &] %o A262772 (Magma) DoubleFactorial:=func< n | &*[n..2 by -2] >; [ n: n in [7..450] | IsPrime(DoubleFactorial(n) -32) ]; // _Vincenzo Librandi_, Oct 01 2015 %o A262772 (PARI) for(n=1, 1e4, if (isprime(prod(k=0, (n-1)\2, n - 2*k ) - 32),print1(n", "))) \\ _Altug Alkan_, Oct 01 2015 %Y A262772 Cf. A006882, A007749, A094144, A123910, A258616. %K A262772 hard,more,nonn %O A262772 1,1 %A A262772 _Robert Price_, Sep 30 2015