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A081710 n! + n# + 1 is prime, where n# is the primorial function. 4
1, 2, 3, 4, 5, 6, 8, 17, 18, 24, 95, 96, 142, 1022, 1120, 1580, 6942, 19255, 19401 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Some of the larger entries may only correspond to probable primes.

LINKS

Table of n, a(n) for n=1..19.

Mike Oakes, Primo-factorials.

Mike Oakes, Primo-factorials, message 12028 in primenumbers Yahoo group, Apr 3, 2003. [Cached copy]

Joe McLean, Interesting Sources of Probable Primes

EXAMPLE

a(2)=2 because 2!+2#+1=5 is prime

CROSSREFS

Cf. A081711, A081712, A081713.

Sequence in context: A249158 A119336 A133706 * A241947 A128421 A115885

Adjacent sequences:  A081707 A081708 A081709 * A081711 A081712 A081713

KEYWORD

nonn,more,hard

AUTHOR

Mike Oakes, Apr 04 2003

EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008

STATUS

approved

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Last modified May 5 19:09 EDT 2021. Contains 343573 sequences. (Running on oeis4.)