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

1, 2, 2, 6, 1170, 64590, 25153800, 25153800, 4747505070, 207187349040, 6703860240000, 26997529639080, 1760354281625940, 1760354281625940, 10718654377787155800

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Crossrefs

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

Sequence in context: A093909 A114362 A007338 * A198880 A201315 A199861

Adjacent sequences: A164322 A164323 A164324 * A164326 A164327 A164328

Keyword

more,nonn

Author

Farideh Firoozbakht, Sep 15 2009

Extensions

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

a(10) and a(11) from Zak Seidov, Sep 17 2009

a(12)=26997529639080 from Zak Seidov, Sep 25 2009

a(13)-a(15) from Giovanni Resta, Apr 01 2017

Status

approved