

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
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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, Primofactorials.
Mike Oakes, Primofactorials, 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



