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A168447
Primes p such that floor(p/6) is also prime.
2
13, 17, 19, 23, 31, 43, 47, 67, 71, 79, 83, 103, 107, 139, 179, 191, 223, 227, 251, 263, 283, 359, 367, 431, 439, 443, 479, 499, 503, 587, 607, 619, 643, 647, 659, 683, 787, 823, 827, 839, 907, 911, 947, 983, 1039, 1087, 1091, 1151, 1163, 1187, 1367, 1399
OFFSET
1,1
LINKS
FORMULA
a(n) >> n log^2 n. - Charles R Greathouse IV, Feb 23 2017
MATHEMATICA
Select[Prime[Range[6! ]], PrimeQ[Floor[ #/6]]&]
PROG
(Magma) [p: p in PrimesUpTo(1400) | IsPrime(Floor(p/6))]; // Vincenzo Librandi, Apr 16 2013
(PARI) is(n)=isprime(n) && isprime(n\6) \\ Charles R Greathouse IV, Feb 23 2017
CROSSREFS
Sequence in context: A156666 A331487 A286042 * A191059 A165681 A214033
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
Definition corrected by R. J. Mathar, Dec 06 2009
STATUS
approved