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 A160028 #14 Aug 02 2025 06:43:38
%S A160028 83,97,337,65617,4294967377,18446744073709551697,
%T A160028 340282366920938463463374607431768211537
%N A160028 Primes of the form 2^(2^k)+81.
%C A160028 Fermat primes of order 81, established by k=0,2,3,4,5,6 and 7.
%C A160028 The number of Fermat primes of order 81 exceeds the number of known Fermat primes by at least 2.
%C A160028 Next term >= 2^2^17 + 81. - _Vincenzo Librandi_, Jun 07 2016
%C A160028 Next term >= 2^2^29 + 81. - _Charles R Greathouse IV_, Jun 07 2016
%F A160028 Intersection of the primes and the set of Fermat numbers F(k,m) = 2^(2^k)+m of order m=81.
%e A160028 For n = 5, 2^32 + 81 = 4294967377 prime.
%t A160028 Select[Table[2^(2^n) + 81, {n, 0, 10}], PrimeQ] (* _Vincenzo Librandi_, Jun 07 2016 *)
%o A160028 (PARI) g(n,m) = for(x=0,n,y=2^(2^x)+m;if(ispseudoprime(y),print1(y",")))
%o A160028 (Magma) [a: n in [0..15] | IsPrime(a) where a is 2^(2^n)+81]; // _Vincenzo Librandi_, Jun 07 2016
%Y A160028 Cf. similar sequences listed in A273547.
%K A160028 nonn
%O A160028 1,1
%A A160028 _Cino Hilliard_, Apr 30 2009, May 01 2009
%E A160028 Edited by _R. J. Mathar_, May 08 2009