A075518 a(n) = floor(prime(n)/4).

0, 0, 1, 1, 2, 3, 4, 4, 5, 7, 7, 9, 10, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 22, 24, 25, 25, 26, 27, 28, 31, 32, 34, 34, 37, 37, 39, 40, 41, 43, 44, 45, 47, 48, 49, 49, 52, 55, 56, 57, 58, 59, 60, 62, 64, 65, 67, 67, 69, 70, 70, 73, 76, 77, 78, 79, 82, 84, 86, 87, 88, 89, 91

Offset: 1

Author

Reinhard Zumkeller, Sep 19 2002

Keywords

• nonn
• easy

Comments

a(n)*4 + A039702(n) = A000040(n).

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A075519.

Programs

Haskell

a075518 = (`div` 4) . a000040  -- Reinhard Zumkeller, Oct 10 2013

Mathematica

Floor[Prime[Range[80]]/4] (* Harvey P. Dale, Dec 27 2011 *)

PARI

a(n) = prime(n) \ 4; \\ Joerg Arndt, Aug 04 2013