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A076379 n!-x!+1 is never prime for x<n. 1
1, 15, 22, 27, 28, 36, 43, 45, 48, 50, 52, 58, 60, 63, 64, 67, 70, 77, 80, 82, 83, 84, 85, 86, 97 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

PROG

(PARI) for (a=1, 100, c=0; for (b=1, a-1, if (b%2<>a%2, continue); if (isprime(a!-b!+1), c=1; break)); if (c==0, print1(a, ", ")))

CROSSREFS

Cf. A076378.

Sequence in context: A115174 A092783 A108638 * A227095 A038753 A006615

Adjacent sequences:  A076376 A076377 A076378 * A076380 A076381 A076382

KEYWORD

nonn

AUTHOR

Jon Perry, Oct 08 2002

STATUS

approved

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Last modified July 21 22:02 EDT 2019. Contains 325210 sequences. (Running on oeis4.)