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 A077375 #25 Jun 01 2025 14:17:55 %S A077375 2,3,4,5,12,13,14,23,57,106,226,227,311,373,1046,1298,1787,1952,2130, %T A077375 2285,2670,3254,3642,4369,13559,33418,66830,213810 %N A077375 Numbers k such that 2^k + prime(k) is prime. %C A077375 All terms < 5000 correspond to certified primes (Primo 2.2.0 beta). - _Ryan Propper_, Aug 08 2005 %H A077375 H. Lifchitz, <a href="http://www.primenumbers.net/Henri/us/MersFermus.htm">Mersenne and Fermat primes field</a> %e A077375 2^12 + prime(12) = 4096 + 43 = 4139 is a prime, so 12 is a term. %Y A077375 Corresponding prime(k) are in A242944. %Y A077375 Cf. A078583, A078686. %K A077375 nonn,more %O A077375 1,1 %A A077375 _Jason Earls_, Nov 30 2002 %E A077375 a(25)-a(26) from _Ryan Propper_, Aug 08 2005 %E A077375 a(27) from _Henri Lifchitz_ added by _Jason Earls_, Jan 12 2008 %E A077375 a(28) from _Michael S. Branicky_, Jun 01 2025