1,1

Jon E. Schoenfield, Table of n, a(n) for n = 1..52

a(n) = pi(A031134(n)).

a(4)=10 because the 4th term of A031134 is the 10th prime number.

Cf. A031131, A031132, A031133, A031134, A122412.

Sequence in context: A082612 A339569 A170926 * A297661 A342333 A136366

Adjacent sequences: A122410 A122411 A122412 * A122414 A122415 A122416

nonn

Jon E. Schoenfield, Sep 02 2006

approved