

A069175


Numbers k such that k1, k+1, 2*k1, 2*k+1, 4*k1 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

Table of n, a(n) for n=1..24.


EXAMPLE

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


MATHEMATICA

lst={}; Do[If[PrimeQ[n1]&&PrimeQ[n+1]&&PrimeQ[2*n1]&&PrimeQ[2*n+1]&&PrimeQ[4*n1]&&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



