

A051856


Numbers n such that (n!)^2+n!+1 is prime.


6




OFFSET

1,3


REFERENCES

H. Dubner, Factorial and primorial primes, J. Rec. Math., 19 (No. 3) (1987)


LINKS



EXAMPLE

6 is in the sequence because (6!)^2+6!+1=519121 is prime.


MATHEMATICA



CROSSREFS



KEYWORD

nonn,hard,more


AUTHOR

Andrew Walker (ajw01(AT)uow.edu.au), Dec 13 1999


EXTENSIONS



STATUS

approved



