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
Links
- Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Programs
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Magma
[p: p in PrimesUpTo(2500) | IsPrime(Floor(p/5))]; // Vincenzo Librandi, Apr 16 2013
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Mathematica
Select[Prime[Range[6! ]],PrimeQ[Floor[ #/5]]&]
Extensions
Definition and values corrected by R. J. Mathar, Dec 06 2009