OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..18
MATHEMATICA
Accumulate[2^MersennePrimeExponent[Range[15]]-1] (* Harvey P. Dale, Feb 28 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Dec 27 2008
EXTENSIONS
More terms from Max Alekseyev, Apr 13 2009
STATUS
approved