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A063508 Numbers n such that !n + 2n - 1 is prime. 2
1, 2, 4, 5, 7, 13, 40, 124, 758, 940 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

MATHEMATICA

Do[ If[ PrimeQ[ Sum[ k!, {k, 0, n - 1} ] + 2n - 1 ], Print[ n ] ], {n, 1, 883} ]

CROSSREFS

Cf. A063106.

Sequence in context: A275368 A332296 A115883 * A101724 A123210 A019277

Adjacent sequences:  A063505 A063506 A063507 * A063509 A063510 A063511

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Aug 09 2001

STATUS

approved

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Last modified February 26 21:58 EST 2020. Contains 332295 sequences. (Running on oeis4.)