login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A069175 Numbers n such that n-1, n+1, 2n-1, 2n+1, 4n-1 and 4n+1 are all prime. 0
211050, 248640, 253680, 410340, 507360, 605640, 1121190, 1138830, 1262100, 2162580, 2172870, 2277660, 4070220, 6305460, 7671510, 11659410, 12577110, 14203770, 14862120, 17472840, 18728640, 18798360, 20520570, 21140700 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..23.

EXAMPLE

211050 is in the sequence because 211049, 211051, 422099, 422101, 844199 and 844201 are all prime.

MATHEMATICA

lst={}; Do[If[PrimeQ[n-1]&&PrimeQ[n+1]&&PrimeQ[2*n-1]&&PrimeQ[2*n+1]&&PrimeQ[4*n-1]&&PrimeQ[4*n+1], Print[n]; AppendTo[lst, n]], {n, 11!}]; lst (* Vladimir Joseph Stephan Orlovsky, Jan 05 2009 *)

CROSSREFS

Cf. A066388. - Vladimir Joseph Stephan Orlovsky, Jan 05 2009

Sequence in context: A172825 A072760 A178421 * A097021 A236086 A123103

Adjacent sequences:  A069172 A069173 A069174 * A069176 A069177 A069178

KEYWORD

nonn

AUTHOR

Don Reble, Apr 09 2002

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 22 14:13 EDT 2019. Contains 322349 sequences. (Running on oeis4.)