OFFSET
1,2
LINKS
Jon E. Schoenfield, Table of n, a(n) for n = 1..52
FORMULA
a(n) = pi(A031133(n)).
EXAMPLE
a(4)=8 because the 4th term of A031133 is the 8th prime number.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jon E. Schoenfield, Sep 02 2006
STATUS
approved