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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
Mike Oakes, Primo-factorials.
Mike Oakes, Primo-factorials, message 12028 in primenumbers Yahoo group, Apr 3, 2003. [Cached copy]
EXAMPLE
a(2)=2 because 2!+2#+1=5 is prime
CROSSREFS
Sequence in context: A249158 A119336 A133706 * A364455 A358175 A241947
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 June 18 21:09 EDT 2024. Contains 373487 sequences. (Running on oeis4.)