Floor of the Chebyshev function theta(n): a(n) = floor(Sum_{primes p <= n } log(p)).

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =3a(5) =3a(6) =5a(7) =5a(8) =5a(9) =5a(10) =7a(11) =7a(12) =10a(13) =10a(14) =10a(15) =10a(16) =13a(17) =13a(18) =16a(19) =16a(20) =16a(21) =16a(22) =19a(23) =19a(24) =19a(25) =19a(26) =19a(27) =19a(28) =22a(29) =22