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A038801 Number of primes less than 10n. 23
4, 8, 10, 12, 15, 17, 19, 22, 24, 25, 29, 30, 31, 34, 35, 37, 39, 41, 42, 46, 46, 47, 50, 52, 53, 55, 57, 59, 61, 62, 63, 66, 66, 68, 70, 72, 73, 75, 77, 78, 80, 81, 82, 85, 87, 88, 91, 92, 93, 95, 97, 97, 99, 99, 101, 102, 104, 106, 107, 109, 111, 114, 114, 115, 118, 120 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
For almost all n, that is for a set of density 1, a(n) = a(n-1), and in all cases a(n) <= a(n-1) + 4. - Charles R Greathouse IV, Aug 27 2014
LINKS
Andrew R. Booker, The Nth Prime Page
MATHEMATICA
Table[ PrimePi[ n*10 ], {n, 1, 66}] (* Robert G. Wilson v *)
PROG
(PARI) a(n)=primepi(10*n) \\ Charles R Greathouse IV, Aug 27 2014
CROSSREFS
Sequence in context: A358228 A230854 A360668 * A310977 A354526 A337813
KEYWORD
nonn
AUTHOR
EXTENSIONS
Edited and corrected by Robert G. Wilson v, Jan 29 2003
STATUS
approved

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Last modified March 19 01:57 EDT 2024. Contains 370952 sequences. (Running on oeis4.)