A126137 a(n) = pi(A037028(n)).

1, 2, 4, 8, 16, 35, 79, 184, 429, 1019, 2467, 6049, 14912, 37128, 93117, 234855, 595341, 1516234, 3877186, 9950346, 25614563, 66124777, 171141897, 443963543, 1154106845, 3005936865, 7842921261, 20496470802, 53645077679, 140599114669, 368973074566, 969455391691

Offset

1,2

Links

Table of n, a(n) for n=1..32.

Example

a(4) = 8 since A037028(3) = 19 and 19 = the 8th prime.
a(5) = 16 since A037028(4) = 53 and 53 = the 16th prime.

Crossrefs

Cf. A000720, A037028.

Sequence in context: A244519 A247293 A337716 * A085294 A195327 A266544

Adjacent sequences: A126134 A126135 A126136 * A126138 A126139 A126140

Keyword

nonn

Author

Gary W. Adamson, Dec 18 2006

Extensions

Name edited by and more terms from Jinyuan Wang, Apr 10 2020

Status

approved