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 A262972 #16 Nov 28 2023 18:33:00 %S A262972 1,3,6,7,10,15,30,34,54,58,103,105,205,223,279,741,2098,3523,9210, %T A262972 37674,89895,101509,217123 %N A262972 Numbers k such that 4^k + 33 is prime. %C A262972 Contains exactly the halved even terms of A247953. %C A262972 The next terms are > 2*10^5. %e A262972 For k = 30, 4^30 + 33 = 1152921504606847009 is prime. %t A262972 Select[Range[0, 250000], PrimeQ[4^# + 33] &] %o A262972 (Magma) [n: n in [0..700] | IsPrime(4^n+33)]; // _Vincenzo Librandi_, Oct 06 2015 %o A262972 (PARI) for(n=1, 1e3, if(isprime(4^n+33), print1(n", "))) \\ _Altug Alkan_, Oct 06 2015 %Y A262972 Cf. A247953, A253772 (similar sequence). %K A262972 nonn,more %O A262972 1,2 %A A262972 _Robert Price_, Oct 05 2015 %E A262972 a(23) derived from A247953 by _Elmo R. Oliveira_, Nov 28 2023