OFFSET
0,1
FORMULA
a(n) = A341397(10^n).
a(n) == 1 (mod 16).
PROG
(PARI) a008457(n) = sumdiv(n, d, (-1)^(n-d)*d^3);
a341397(n) = 1+16*sum(k=1, n, a008457(k));
a(n) = a341397(10^n);
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jun 21 2024
STATUS
approved