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A289497 Number of primes in the interval [6n, 7n]. 8
1, 1, 1, 0, 1, 2, 2, 1, 2, 2, 3, 3, 3, 2, 3, 5, 4, 2, 2, 4, 4, 4, 4, 5, 5, 6, 5, 5, 6, 5, 5, 5, 5, 5, 7, 7, 8, 7, 7, 7, 8, 8, 7, 7, 8, 8, 6, 6, 6, 8, 9, 8, 7, 8, 10, 10, 10, 10, 9, 9, 10, 11, 11, 10, 10, 12, 12, 12, 12, 12, 12, 13, 13, 11, 12, 12, 10, 9, 10, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
PROG
(PARI) a(n) = primepi(7*n) - primepi(6*n); \\ Michel Marcus, Jul 08 2017
CROSSREFS
Sequence in context: A029289 A181834 A194848 * A029328 A109831 A247352
KEYWORD
nonn,easy
AUTHOR
FUNG Cheok Yin, Jul 07 2017
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)