A096213 Primes of the form 10^n + 10^(n-5) - 1.

1000009999, 10000099999, 1000009999999999, 100000999999999999999999, 100000999999999999999999999999, 1000009999999999999999999999999, 10000099999999999999999999999999999999999999999999999999999999999999999999

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Mathematica

Select[Table[10^n+10^(n-5)-1, {n, 80}], PrimeQ] (* Harvey P. Dale, May 22 2014 *)

Prog

(PARI) f(n, z) = for(x=z, n, y=10^x+10^(x-z)-1; if(ispseudoprime(y), print1(y", ")))

Crossrefs

Sequence in context: A017649 A117979 A332308 * A048939 A269120 A095733

Adjacent sequences: A096210 A096211 A096212 * A096214 A096215 A096216

Keyword

nonn

Author

Cino Hilliard, Jul 28 2004

Status

approved