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A180630 Numbers n such that 9*n!-1 is a prime. 0
2, 3, 12, 15, 16, 25, 30, 38, 59, 82, 114, 168, 172, 175, 213, 229, 251, 302, 311, 554 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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: A015756 A163906 A302844 * A173079 A173903 A154785

Adjacent sequences:  A180627 A180628 A180629 * A180631 A180632 A180633

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Sep 13 2010

STATUS

approved

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Last modified April 23 23:13 EDT 2019. Contains 322389 sequences. (Running on oeis4.)