

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

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


EXAMPLE

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


CROSSREFS



KEYWORD

nonn,more,hard


AUTHOR



EXTENSIONS

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


STATUS

approved



