A092733 Sum of two consecutive primes of the form 2^x+1 (including Fermat primes and 2).

5, 8, 22, 274, 65794

Offset: 1

Author

Jorge Coveiro, Apr 12 2004

Keywords

• nonn
• more

Examples

			a(1) = [2^0+1] + [2^(2^0)+1]
a(2) = [2^(2^0)+1] + [2^(2^1)+1]
a(3) = [2^(2^1)+1] + [2^(2^2)+1]
a(4) = [2^(2^2)+1] + [2^(2^3)+1]
a(5) = [2^(2^3)+1] + [2^(2^4)+1]
		

Crossrefs

Cf. A092506, A019434, A063897.

Programs

Mathematica

Total/@Partition[Select[2^Range[0,50]+1,PrimeQ],2,1] (* Harvey P. Dale, Jun 21 2021 *)

Extensions

Offset corrected by Arkadiusz Wesolowski, Oct 22 2011