OFFSET
1,1
LINKS
Jon E. Schoenfield, Table of n, a(n) for n = 1..52
FORMULA
a(n) = pi(A031134(n)).
EXAMPLE
a(4)=10 because the 4th term of A031134 is the 10th prime number.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jon E. Schoenfield, Sep 02 2006
STATUS
approved