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 A338976 #17 Dec 20 2020 16:45:41 %S A338976 2,11,13,17,19,59,71,97,107,109,149,167,181,239,271,419,431,499,509, %T A338976 523,547,563,613,631,691,727,811,853,859,983,1009,1063,1087,1117,1151, %U A338976 1193,1229,1409,1427,1487,1559,1579,1601,1759,1823,1913,1973,2039,2099,2161,2237,2251,2309,2411,2437,2473 %N A338976 Primes p such that p*A007953(p)+1 is prime. %H A338976 Robert Israel, <a href="/A338976/b338976.txt">Table of n, a(n) for n = 1..10000</a> %e A338976 a(3) = 13 is a term because 13 and 13*(1+3)+1 = 53 are prime. %p A338976 select(t -> isprime(t) and isprime(t*convert(convert(t,base,10),`+`)+1), [$2..10^4]); %o A338976 (PARI) isok(p) = isprime(p) && isprime(p*sumdigits(p)+1); \\ _Michel Marcus_, Dec 18 2020 %Y A338976 Cf. A007953, A057147. %Y A338976 Subsequence of A119449. %K A338976 nonn,base %O A338976 1,1 %A A338976 _J. M. Bergot_ and _Robert Israel_, Dec 18 2020