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A055559 Primes of the form 2999...999. 0
29, 2999, 2999999, 29999999, 29999999999999999999, 2999999999999999999999999999, 29999999999999999999999999999999999999999999 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 18 14:52 EDT 2019. Contains 328161 sequences. (Running on oeis4.)