A075518 -id:A075518 - cp's OEIS frontend

A075519 Primes p such that floor(p/4) is prime.

11, 13, 23, 29, 31, 47, 53, 71, 79, 127, 149, 151, 167, 173, 191, 239, 269, 271, 293, 317, 359, 389, 431, 439, 509, 557, 599, 607, 631, 653, 719, 727, 773, 797, 911, 919, 967, 1031, 1087, 1109

Offset: 1

Reinhard Zumkeller, Sep 19 2002

nonn

			23 is a term, as 23 = 4*5 + 3.

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Cf. A075518, A075521.

[p: p in PrimesUpTo(2000)| IsPrime(Floor(p/4))]; // Vincenzo Librandi, Aug 04 2013

Select[Prime[Range[6! ]],PrimeQ[Floor[ #/4]]&] (* Vladimir Joseph Stephan Orlovsky, Nov 25 2009 *)

Definition corrected by Eric M. Schmidt, Aug 04 2013

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

Original entry on oeis.org

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

Vladimir Joseph Stephan Orlovsky, Sep 20 2008

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

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

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

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

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

Edited by R. J. Mathar, Sep 21 2008

cp's OEIS Frontend

A075519 Primes p such that floor(p/4) is prime.

Views

Author

Keywords

Examples

Links

Crossrefs

Programs

Magma

Mathematica

Extensions