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A118222 Numbers n such that n! * p(n)# + 1 is prime. 1
1, 2, 3, 48, 151, 312, 445 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Seven terms found and primes proved by PrimeForm ([N-1, Brillhart-Lehmer-Selfridge]). There are no more terms <= 2100.

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

3 is a term as 3! * p(3)# + 1 = 3*2*1 * 5*3*2 + 1 = 181, a prime.

CROSSREFS

Cf. A118223.

Sequence in context: A163488 A215536 A173355 * A191594 A208204 A067092

Adjacent sequences:  A118219 A118220 A118221 * A118223 A118224 A118225

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Apr 15 2006

STATUS

approved

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Last modified August 2 13:35 EDT 2021. Contains 346424 sequences. (Running on oeis4.)