

A055559


Primes of the form 2999...999.


0




OFFSET

1,1


COMMENTS

a(8)=29999999999999999999999999999999999999999999999999999999.  Vincenzo Librandi, Aug 07 2010


LINKS

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


EXAMPLE

3*10^k  1 is prime for {1,3,6,7,19,27,43,55,207}; k gives the number of 9's in these numbers.


CROSSREFS

Cf. A051200.
Sequence in context: A171720 A305138 A091751 * A144233 A125074 A033519
Adjacent sequences: A055556 A055557 A055558 * A055560 A055561 A055562


KEYWORD

base,nonn


AUTHOR

Labos Elemer, Jul 10 2000


EXTENSIONS

Erroneous Formula entry removed by Jon E. Schoenfield, Jan 14 2018


STATUS

approved



