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 A097521 #18 Nov 22 2019 06:14:27 %S A097521 2,2,2,6,2,14,12,50,296,74,642,980,1760,896,2774,118112,44060,5850 %N A097521 Difference between F(n) = 2^(2^n)+1 and nextprime(F(n)) where F(n) is the n-th Fermat Number. %C A097521 In the Name, nextprime means A151800, not A007918. - _Jeppe Stig Nielsen_, Nov 18 2019 %C A097521 a(n) = A129786(n)-1 except in the rare case that F(n) is a prime. - _Jeppe Stig Nielsen_, Nov 18 2019 %F A097521 a(n) = A013632(A000215(n)). - _Michel Marcus_, Nov 18 2019 %e A097521 F(5) = 4294967297. Nextprime(F(5)) = 4294967311. %e A097521 4294967311 - 4294967297 = 14 the 6th entry in the table. %o A097521 (PARI) for(n=0,+oo,print1(nextprime(2^(2^n)+2)-(2^(2^n)+1),", ")) \\ _Jeppe Stig Nielsen_, Nov 18 2019 %Y A097521 Cf. A000215, A013632, A151800, A129786. %K A097521 nonn,more %O A097521 0,1 %A A097521 _Cino Hilliard_, Aug 27 2004 %E A097521 More terms with the help of A129786 from _Jeppe Stig Nielsen_, Nov 18 2019