OFFSET
1,3
COMMENTS
Also sum of all proper divisors of all positive integers <= prime(n)-1.
Also zero together with the numbers that are repeated in A244049.
FORMULA
a(n) ~ (Pi^2/12 - 1/2) * n^2 * log(n)^2. - Amiram Eldar, Mar 22 2024
PROG
(PARI) a(n) = sum(i=2, prime(n), sigma(i)-i-1); \\ Michel Marcus, Sep 29 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Jun 30 2014
EXTENSIONS
More terms from Michel Marcus, Sep 29 2014
STATUS
approved