A100903 Numbers n such that (10^n-1)^2-2 is prime.

1, 8, 21, 123, 4299, 6128, 11760, 18884, 40293

Offset

1,2

Comments

Next term > 70000.

Links

Table of n, a(n) for n=1..9.

S. Harvey, Carol and Kynea Primes.

Prog

(PARI) is(n)=ispseudoprime((10^n-1)^2-2) \\ Charles R Greathouse IV, Feb 19 2016

Crossrefs

Sequence in context: A220611 A297340 A220580 * A358720 A240648 A231525

Adjacent sequences: A100900 A100901 A100902 * A100904 A100905 A100906

Keyword

nonn,more

Author

Ray Chandler, Nov 21 2004

Status

approved