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A142959
Numbers n such that both (n!)^2 + n! + 1 and (n!)^2 + 1 are prime.
1
1, 2, 3, 4, 76
OFFSET
1,2
COMMENTS
For the numbers of digits of the associated primes, see A142960.
REFERENCES
J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 76, pp 26, Ellipses, Paris 2008.
FORMULA
A046029 INTERSECT A051856. [From R. J. Mathar, Aug 08 2008]
CROSSREFS
Sequence in context: A066776 A115901 A073325 * A173573 A037395 A009496
KEYWORD
nonn
AUTHOR
Lekraj Beedassy, Jul 13 2008
STATUS
approved