A168446 Primes p such that floor(p/5) is also prime.

11, 13, 17, 19, 29, 37, 59, 67, 89, 97, 149, 157, 239, 269, 307, 337, 359, 367, 397, 419, 449, 487, 509, 547, 569, 659, 757, 787, 839, 907, 967, 997, 1117, 1259, 1289, 1319, 1409, 1559, 1567, 1657, 1747, 1867, 1949, 1987, 2099, 2287, 2309, 2339, 2399, 2437, 2459

Offset

1,1

Links

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

Mathematica

Select[Prime[Range[6! ]], PrimeQ[Floor[ #/5]]&]

Prog

(Magma) [p: p in PrimesUpTo(2500) | IsPrime(Floor(p/5))]; // Vincenzo Librandi, Apr 16 2013

Crossrefs

Cf. A075519, A168447.

Sequence in context: A186811 A038926 A356466 * A275467 A045798 A267277

Adjacent sequences: A168443 A168444 A168445 * A168447 A168448 A168449

Keyword

nonn,easy

Author

Vladimir Joseph Stephan Orlovsky, Nov 25 2009

Extensions

Definition and values corrected by R. J. Mathar, Dec 06 2009

Status

approved