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A180629 Numbers n such that 8*n!-1 is a prime. 0
0, 1, 3, 4, 8, 33, 121, 177, 190, 276, 473, 484, 924, 937, 1722, 2626, 4077, 4464 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Tested to 4700. [From Robert G. Wilson v, Sep 27 2010]

LINKS

Table of n, a(n) for n=1..18.

Index entries for sequences related to numbers of primes of the form k*n!+-1

MATHEMATICA

fQ[n_] := PrimeQ[8 n! - 1]; k = 0; lst = {}; While[k < 1501, If[ fQ@k, AppendTo[lst, k]; Print@k]; k++ ]; lst

CROSSREFS

Sequence in context: A168382 A155701 A119529 * A258372 A096847 A011993

Adjacent sequences:  A180626 A180627 A180628 * A180630 A180631 A180632

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Sep 13 2010

EXTENSIONS

a(15)-a(18) from Robert G. Wilson v, Sep 27 2010

STATUS

approved

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Last modified March 23 05:36 EDT 2019. Contains 321422 sequences. (Running on oeis4.)