A144769 a(n) = floor(prime(n)/3).

0, 1, 1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 13, 14, 15, 17, 19, 20, 22, 23, 24, 26, 27, 29, 32, 33, 34, 35, 36, 37, 42, 43, 45, 46, 49, 50, 52, 54, 55, 57, 59, 60, 63, 64, 65, 66, 70, 74, 75, 76, 77, 79, 80, 83, 85, 87, 89, 90, 92, 93, 94, 97, 102, 103, 104, 105, 110, 112, 115, 116

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, Sep 20 2008

Keywords

• nonn
• easy

Crossrefs

See A130290 for prime(n)/2 or A075518 for prime(n)/4.

Programs

Maple

A144769 := proc(n) floor(ithprime(n)/3); end; # R. J. Mathar, Sep 21 2008

Mathematica

Quotient[Prime[Range[5! ]],3]

PARI

a(n)=prime(n)\3 \\ Charles R Greathouse IV, Oct 05 2011

Formula

a(n) = floor(A000040(n)/3). - R. J. Mathar, Sep 21 2008

Extensions

Edited by R. J. Mathar, Sep 21 2008