OFFSET
1,1
EXAMPLE
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]
MATHEMATICA
Total/@Partition[Select[2^Range[0, 50]+1, PrimeQ], 2, 1] (* Harvey P. Dale, Jun 21 2021 *)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Jorge Coveiro, Apr 12 2004
EXTENSIONS
Offset corrected by Arkadiusz Wesolowski, Oct 22 2011
STATUS
approved