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 A069175 Numbers k such that k-1, k+1, 2*k-1, 2*k+1, 4*k-1 and 4*k+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 1,1 LINKS 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. Sequence in context: A172825 A072760 A178421 * A340158 A097021 A236086 Adjacent sequences: A069172 A069173 A069174 * A069176 A069177 A069178 KEYWORD nonn AUTHOR Don Reble, Apr 09 2002 EXTENSIONS Offset changed to 1 by Georg Fischer, Sep 23 2022 STATUS approved

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Last modified December 3 05:56 EST 2022. Contains 358512 sequences. (Running on oeis4.)