A142959 Numbers n such that both (n!)^2 + n! + 1 and (n!)^2 + 1 are prime.

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.

Links

Table of n, a(n) for n=1..5.

Formula

A046029 INTERSECT A051856. [From R. J. Mathar, Aug 08 2008]

Crossrefs

Sequence in context: A066776 A115901 A073325 * A173573 A037395 A009496

Adjacent sequences: A142956 A142957 A142958 * A142960 A142961 A142962

Keyword

nonn

Author

Lekraj Beedassy, Jul 13 2008

Status

approved