OFFSET
1,1
FORMULA
EXAMPLE
Since A000043(15) = 1279, a(15) = 1+2+7+9 = 19. - Timothy L. Tiffin, Jul 14 2021
MATHEMATICA
Table[Plus @@ IntegerDigits[e], {e, MersennePrimeExponent[Range[47]]}] (* Amiram Eldar, Jul 16 2021 *)
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Edmund Algeo, Jul 03 2008
EXTENSIONS
a(39)-a(40) corrected by and a(41)-a(47) from Timothy L. Tiffin, Jul 14 2021
a(48) from Amiram Eldar, Oct 18 2024
STATUS
approved