OFFSET
1,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..150
Wikipedia, Herbrand-Ribet theorem
EXAMPLE
zeta(-11) = 691/32760 and 691 are divisible by A000928(47). So a(47) = 11.
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jan 18 2017
STATUS
approved