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%I #14 Mar 04 2023 11:55:56
%S 1,2,2,3,3,3,4,4,4,5,5,5,6,6,6,7,7,7,7,8,8,8,9,9,9,9,10,10,10,10,11,
%T 11,11,11,12,12,12,12,13,13,13,13,14,14,14,14,14,15,15,15,15,16,16,16,
%U 16,17,17,17,17,17,18,18,18,18,19,19,19,19,19,20,20
%N Nearest integer to R(n) = the Riemann prime number formula.
%C This is a good approximation to pi(n), the number of prime numbers <= n.
%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/RiemannPrimeCountingFunction.html">Riemann Prime Counting Function</a>.
%Y Cf. A000720, A047784, A052434.
%K nonn
%O 2,2
%A _Henry Bottomley_, Mar 21 2000