A053620 Nearest integer to R(n) = the Riemann prime number formula.

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, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 19, 20, 20

Offset: 2

Author

Henry Bottomley, Mar 21 2000

Keywords

• nonn

Comments

This is a good approximation to pi(n), the number of prime numbers <= n.

Links

• Eric Weisstein's World of Mathematics, Riemann Prime Counting Function.

Crossrefs

Cf. A000720, A047784, A052434.