The On-Line Encyclopedia of Integer Sequences (OEIS)

A152295 revision #4

A152295

Primes of the form : (p-n)/(n+1)=prime and (n+1)*p+n=prime. n=5.

17, 71, 83, 107, 191, 227, 251, 263, 431, 443, 479, 503, 587, 827, 839, 911, 983, 1091, 1151, 1163, 1187, 1619, 1667, 1847, 1907, 2087, 2243, 2459, 2591, 3023, 3467, 4463, 4871, 4943, 5471, 5519, 5651, 5807, 5903, 6131, 6203, 6299, 6311, 6563, 6983, 7127

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

This is the general form : (p-n)/(n+1)=primeand(n+1)*p+n=prime; 'Safe' primes and'Sophie Germain' primes just one part of this general form; If n=1 then we got'Safe' primes and'Sophie Germain' primes.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..3000

MATHEMATICA

lst={}; n=5; Do[p=Prime[k]; If[PrimeQ[(p-n)/(n+1)]&&PrimeQ[(n+1)*p+n], AppendTo[lst, p]], {k, 7!}]; lst

Select[Prime[Range[1000]], AllTrue[{(#-5)/6, 6#+5}, PrimeQ]&] (* This program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Jul 29 2014 *)

CROSSREFS

Cf. A059455, A152292, A152293, A152294

Sequence in context: A180532 A179038 A179039 * A039407 A043230 A044010

Adjacent sequences: A152292 A152293 A152294 * A152296 A152297 A152298

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Dec 02 2008

STATUS

approved