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A164325 a(n) is the smallest number m such that (2k-1)m+1 is prime for all 0<k<n+1. 1

%I

%S 1,2,2,6,1170,64590,25153800,25153800,4747505070,207187349040,

%T 6703860240000,26997529639080,1760354281625940,1760354281625940,

%U 10718654377787155800

%N a(n) is the smallest number m such that (2k-1)m+1 is prime for all 0<k<n+1.

%Y Cf. A088250, A071576, A164326, A088251, A088651, A125838, A125839, A088252.

%K more,nonn

%O 1,2

%A _Farideh Firoozbakht_, Sep 15 2009

%E a(5) corrected by Zak Seidov, Sep 16 2009

%E a(10) and a(11) from _Zak Seidov_, Sep 17 2009

%E a(12)=26997529639080 from _Zak Seidov_, Sep 25 2009

%E a(13)-a(15) from _Giovanni Resta_, Apr 01 2017

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Last modified May 22 21:17 EDT 2019. Contains 323504 sequences. (Running on oeis4.)