OFFSET
0,4
LINKS
Hugo Pfoertner, Table of n, a(n) for n = 0..78 (terms 0..56 from Jens Kruse Andersen)
FORMULA
a(n) = primepi(sqrt(A033844(n))). - Jens Kruse Andersen, Oct 20 2014
MATHEMATICA
PrimePi[Sqrt[Prime[2^n]]]
CROSSREFS
KEYWORD
nonn
AUTHOR
Russ Cox, Oct 19 2014
EXTENSIONS
More terms from Jens Kruse Andersen, Oct 20 2014
STATUS
approved