OFFSET
1,1
FORMULA
EXAMPLE
a(5)=81 because the 5th Mersenne prime is 8191, A000668(5)=8191.
CROSSREFS
KEYWORD
base,nonn,more,less
AUTHOR
Omar E. Pol, Apr 01 2008
EXTENSIONS
a(40)-a(47) from Ivan Panchenko, Apr 17 2018
STATUS
approved