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 A268211 #14 Sep 08 2022 08:46:15 %S A268211 2,5,65, %T A268211 110427941548649020598956093796432407239217743554726184882600387580788737 %N A268211 Numbers n of the form 2^k + 1 such that n + k is a prime q (for k >= 0). %C A268211 Subsequence of A000051. %C A268211 Corresponding values of numbers k are in A100359 (numbers n such that 2^n+n+1 is prime). %C A268211 Corresponding values of primes q are in A061421 (primes of the form 2^n+n+1). %F A268211 a(n) = A061421(n) - A100359(n). %e A268211 65 = 2^6 + 1 is a term because 65 + 6 = 71 (prime). %t A268211 2^# + 1 &@ Select[Range[0, 600], PrimeQ[2^# + # + 1] &] (* _Michael De Vlieger_, Jan 29 2016 *) %o A268211 (Magma) [2^n + 1: n in [0..600] | IsPrime(2^n + n + 1)] %Y A268211 Cf. A061421, A100359, A268209. %K A268211 nonn %O A268211 1,1 %A A268211 _Jaroslav Krizek_, Jan 28 2016