OFFSET
1,2
EXAMPLE
a(6) = 846; a(6) = Sum_{d|6} Sum_{p|6, p prime} p^d = Sum_{d|6} (2^d + 3^d) = (2^1 + 3^1) + (2^2 + 3^2) + (2^3 + 3^3) + (2^6 + 3^6) = 846.
CROSSREFS
KEYWORD
nonn
AUTHOR
Wesley Ivan Hurt, Feb 18 2022
STATUS
approved