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 A143713 #27 Apr 25 2025 04:33:47 %S A143713 3,4,5,6,10,22,31,92,174,237,886,1075,1357,2428,3700,6319,9116 %N A143713 Numbers k such that k! - prime(k-1) is prime. %t A143713 Select[Range[2,1000],PrimeQ[#!-Prime[#-1]]&] (* _Harvey P. Dale_, Oct 31 2013 *) %o A143713 (PARI) for(n=2,1000, if(isprime(n! - prime(n-1)), print1(n, ", "))) %Y A143713 Cf. A064401. %K A143713 nonn,more %O A143713 1,1 %A A143713 _Alexander R. Povolotsky_, Aug 29 2008 %E A143713 a(11) from _Harvey P. Dale_, Oct 31 2013 %E A143713 a(12)-a(15) from _Metin Sariyar_, Sep 27 2019 %E A143713 a(16) from _Michael S. Branicky_, Jun 08 2023 %E A143713 a(17) from _Michael S. Branicky_, Apr 23 2025