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A126137
a(n) = pi(A037028(n)).
0
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
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
Sequence in context: A244519 A247293 A337716 * A085294 A195327 A266544
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Dec 18 2006
EXTENSIONS
Name edited by and more terms from Jinyuan Wang, Apr 10 2020
STATUS
approved