A289496 Number of primes in the interval [5n, 6n].

1, 1, 1, 1, 1, 1, 2, 3, 2, 2, 2, 3, 3, 4, 3, 2, 3, 4, 6, 5, 3, 3, 3, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 6, 6, 5, 7, 7, 6, 7, 8, 8, 9, 9, 8, 9, 9, 9, 9, 8, 9, 10, 9, 8, 8, 7, 8, 9, 10, 10, 10, 9, 10, 11, 11, 12, 11, 12, 11, 11, 11, 12, 13, 13, 12, 13, 14, 14, 14

Offset

1,7

Links

FUNG Cheok Yin, Table of n, a(n) for n = 1..10000

Mathematica

Table[Count[Range[5n, 6n], _?PrimeQ], {n, 80}] (* Harvey P. Dale, Sep 07 2017 *)

Crossrefs

Cf. A035250, A289493, A289494, A289495, A289497, A289498, A289499, A289500.

Sequence in context: A103266 A185150 A299229 * A371256 A248973 A305048

Adjacent sequences: A289493 A289494 A289495 * A289497 A289498 A289499

Keyword

nonn,easy

Author

FUNG Cheok Yin, Jul 07 2017

Status

approved