OFFSET
1,2
COMMENTS
Observe that magnitude of a(n) is not far from that of (n-1)!.
MATHEMATICA
s = 0; k = 1; Do[ While[s = s + MoebiusMu[k]; s + PrimePi[k] < n!, k++ ]; Print[k]; k++, {n, 10}] (* Robert G. Wilson v, Apr 30 2004 *)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Labos Elemer, Apr 28 2004
EXTENSIONS
a(9)-a(10) from Robert G. Wilson v, Apr 30 2004
a(11)-a(13) from Donovan Johnson, Jun 21 2012
STATUS
approved