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

Author

FUNG Cheok Yin, Jul 07 2017

Keywords

• nonn
• easy

Links

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

Crossrefs

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

Programs

Mathematica

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