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 A379806 #9 Feb 09 2025 06:56:26 %S A379806 2,3,10,51,4462,6883 %N A379806 Numbers k such that 2^prime(k) - 3 is prime. %F A379806 Apply PrimePi to A283266. %e A379806 Prime(3) = 5 and 2^5 - 3 = 29 is prime, so k = 3 is a member. %o A379806 (PARI) isok(k) = ispseudoprime(1<<prime(k)-3); \\ _Jinyuan Wang_, Feb 09 2025 %Y A379806 Cf. A000720, A050414, A283266. %K A379806 nonn,more %O A379806 1,1 %A A379806 _N. J. A. Sloane_, Feb 01 2025