%I #21 Apr 03 2023 10:36:09

%S 50847534,98222287,144449537,189961812,234954223,279545368,323804352,

%T 367783654,411523195,455052511,498388617,541555851,584570200,

%U 627440336,670180516,712799821,755305935,797703398,840000027,882206716,924324489

%N Number of primes less than n*10^9.

%H Robert G. Wilson v, <a href="/A038818/b038818.txt">Table of n, a(n) for n = 1..10000</a>

%H Andrew R. Booker, <a href="https://t5k.org/nthprime/">The Nth Prime Page</a>

%H Thomas R. Nicely, <a href="https://faculty.lynchburg.edu/~nicely/index.html">Some Results of Computational Research in Prime Numbers</a> [See local copy in A007053]

%H Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/primes.html">Tables of values of pi(x) and of pi2(x)</a>

%t Table[ PrimePi[ n*10^9 ], {n, 1, 22}]

%o (PARI) a(n)=primepi(10^9*n) \\ _Charles R Greathouse IV_, Apr 29 2015

%Y Cf. A038801, A028505, A038812, A038813, A038814, A038815, A038816, A038817, A038819, A038820, A038821, A080122, A080123, A080124, A080125, A080126, A080127, A080128, A080129.

%K nonn

%O 1,1

%A _Jeff Burch_

%E Edited and extended by _Robert G. Wilson v_, Jan 29 2003