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A175580 Numbers n with property that numbers (2k+1)n-2k k=0..7 are all prime. 1

%I #2 Mar 30 2012 17:26:35

%S 25153801,507079861,610817971,942962791,1040241511,1223511871,

%T 1797884761,2200595671,2291395471,2304999061,2429694541,3078011161,

%U 3509229571,3733373491,3896865631,4017254011,4747505071,4847389471

%N Numbers n with property that numbers (2k+1)n-2k k=0..7 are all prime.

%C a(17)=4747505071=A175568(1).

%C All terms are of form 210m+1 with m = 119780, 2414666, 2908657, 4490299, 4953531, 5826247, 8561356, 10479027, 10911407, 10976186, 11569974, 14657196, 16710617, 17777969, 18556503, 19129781, 22607167, 23082807, 23543359, 25241957, 26655168, 32729717, 33285539, 41423243, 41720261, 43190411, 45671932

%Y Cf. A175568 Numbers n with property that (2k+1)n-2k k=0..8 are all prime,

%Y Cf. A175566 a(n) = the least prime p such that (2*k + 1)*p - 2*k, k=1..n are all prime.

%K nonn

%O 1,1

%A _Zak Seidov_, Jul 15 2010

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