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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)