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A180626 Numbers n such that 9*n!+1 is a prime. 2
2, 6, 7, 10, 13, 15, 24, 29, 33, 44, 98, 300, 548, 942, 1099, 1176, 1632, 1794, 3676, 3768 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Tested to 4500. [From Robert G. Wilson v, Sep 28 2010]

LINKS

Table of n, a(n) for n=1..20.

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

MATHEMATICA

fQ[n_] := PrimeQ[9 n! + 1]; k = 0; lst = {}; While[k < 1501, If[ fQ@k, AppendTo[lst, k]; Print@k]; k++ ]; lst

CROSSREFS

Sequence in context: A074223 A029459 A014862 * A061943 A029507 A047552

Adjacent sequences:  A180623 A180624 A180625 * A180627 A180628 A180629

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Sep 13 2010

EXTENSIONS

a(17)-a(20) from Robert G. Wilson v, Sep 28 2010

STATUS

approved

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Last modified February 16 18:53 EST 2019. Contains 320165 sequences. (Running on oeis4.)