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A140528
Sum of digits of Mersenne prime exponents.
0
2, 3, 5, 7, 4, 8, 10, 4, 7, 17, 8, 10, 8, 13, 19, 7, 13, 13, 14, 13, 32, 23, 8, 29, 11, 16, 28, 23, 10, 19, 19, 38, 32, 37, 38, 29, 23, 41, 37, 28, 31, 41, 25, 38, 41, 28, 26, 41
OFFSET
1,1
FORMULA
a(n) = A007953(A000043(n)). - Michel Marcus, Jul 15 2021
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
Sequence in context: A126049 A291603 A082331 * A065037 A366303 A366030
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