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 A309671 #11 Aug 24 2019 14:13:13 %S A309671 7,11,13,17,23,83,89,97,151,373,433,857,4013,8821,12959 %N A309671 Primes prime(m) such that G = prime(m-1)# - prime(m) is prime. %C A309671 G = prime(n-1)# - prime(n) where G is a prime is a special case of A090188 where (k=1). %e A309671 7 is a term because 23 = 2*3*5 - 7 is prime. %o A309671 (PARI) primo(p) = my(ip=primepi(p)); factorback(primes(ip)); \\ A002110 %o A309671 isok(p) = isprime(p) && isprime(primo(precprime(p-1)) - p); %Y A309671 Cf. A002110, A065314, A060882, A096649, A090188, A065316. %K A309671 nonn,more %O A309671 1,1 %A A309671 _Mohamed Sami Gattoufi_, Aug 11 2019