The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 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 Cf. A075519, A168446. Sequence in context: A156666 A331487 A286042 * A191059 A165681 A214033 Adjacent sequences: A168444 A168445 A168446 * A168448 A168449 A168450 KEYWORD nonn,easy AUTHOR Vladimir Joseph Stephan Orlovsky, Nov 25 2009 EXTENSIONS Definition corrected by R. J. Mathar, Dec 06 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 3 16:08 EDT 2023. Contains 365868 sequences. (Running on oeis4.)