OFFSET
1,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Mertens Function
PROG
(PARI) isok(n) = sum(k=1, n, moebius(k)) == -1; \\ Michel Marcus, Nov 20 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Neven Juric (neven.juric(AT)apis-it.hr), Sep 10 2010
STATUS
approved