OFFSET
1,2
EXAMPLE
a(6) = 187128; a(6) = Sum_{d|6} Sum_{p|6, p prime} 6^lcm(d,p) = Sum_{d|6} (6^lcm(d,2) + 6^lcm(d,3)) = (6^lcm(1,2) + 6^lcm(2,2) + 6^lcm(3,2) + 6^lcm(6,2)) + (6^lcm(1,3) + 6^lcm(2,3) + 6^lcm(3,3) + 6^lcm(6,3)) = 187128.
CROSSREFS
KEYWORD
nonn
AUTHOR
Wesley Ivan Hurt, Feb 21 2022
STATUS
approved