OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Proth Prime.
FORMULA
a(n) = Sum_{i=1..n} A080076(i).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Jan 29 2010
EXTENSIONS
More terms from R. J. Mathar, Apr 15 2010
STATUS
approved