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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A038818 Number of primes less than n*10^9. 21 50847534, 98222287, 144449537, 189961812, 234954223, 279545368, 323804352, 367783654, 411523195, 455052511, 498388617, 541555851, 584570200, 627440336, 670180516, 712799821, 755305935, 797703398, 840000027, 882206716, 924324489 (list; graph; refs; listen; history; text; internal format) OFFSET 1,1 LINKS Robert G. Wilson v, Table of n, a(n) for n = 1..10000 Andrew R. Booker, The Nth Prime Page Thomas R. Nicely, Some Results of Computational Research in Prime Numbers [See local copy in A007053] Tomás Oliveira e Silva, Tables of values of pi(x) and of pi2(x) MATHEMATICA Table[ PrimePi[ n*10^9 ], {n, 1, 22}] PROG (PARI) a(n)=primepi(10^9*n) \\ Charles R Greathouse IV, Apr 29 2015 CROSSREFS Cf. A038801, A028505, A038812, A038813, A038814, A038815, A038816, A038817, A038819, A038820, A038821, A080122, A080123, A080124, A080125, A080126, A080127, A080128, A080129. Sequence in context: A080796 A068242 A038829 * A251497 A015392 A211237 Adjacent sequences: A038815 A038816 A038817 * A038819 A038820 A038821 KEYWORD nonn AUTHOR Jeff Burch EXTENSIONS Edited and extended by Robert G. Wilson v, Jan 29 2003 STATUS approved

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Last modified August 23 03:44 EDT 2023. Contains 364748 sequences. (Running on oeis4.)