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%I #9 Apr 11 2020 05:47:01
%S 1,2,4,8,16,35,79,184,429,1019,2467,6049,14912,37128,93117,234855,
%T 595341,1516234,3877186,9950346,25614563,66124777,171141897,443963543,
%U 1154106845,3005936865,7842921261,20496470802,53645077679,140599114669,368973074566,969455391691
%N a(n) = pi(A037028(n)).
%e a(4) = 8 since A037028(3) = 19 and 19 = the 8th prime.
%e a(5) = 16 since A037028(4) = 53 and 53 = the 16th prime.
%Y Cf. A000720, A037028.
%K nonn
%O 1,2
%A _Gary W. Adamson_, Dec 18 2006
%E Name edited by and more terms from _Jinyuan Wang_, Apr 10 2020