OFFSET
1,1
COMMENTS
It appears that the ratio of a(j+1)/a(j) is a bit larger than 2 and perhaps tends to 2. Why?
MATHEMATICA
s = 0; k = 1; Do[ While[s = s + MoebiusMu[k]; s + PrimePi[k] < 2^n, k++ ]; Print[k]; k++, {n, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, May 03 2004
EXTENSIONS
a(21) - a(24) from Robert G. Wilson v, May 06 2004
a(25)-a(31) from Donovan Johnson, Jun 21 2012
STATUS
approved