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A141311 Primes consisting of a digit and a nonempty string of 9's (i.e., primes of the form k*10^m - 1, where k is any digit). 5
19, 29, 59, 79, 89, 199, 499, 599, 1999, 2999, 4999, 8999, 49999, 59999, 79999, 199999, 599999, 799999, 2999999, 4999999, 19999999, 29999999, 59999999, 89999999, 799999999, 59999999999, 79999999999, 59999999999999, 499999999999999, 29999999999999999999 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

k can never be 1, 4, or 7, because if it were, k*10^m - 1 would be divisible by 3.

LINKS

Jon E. Schoenfield, Table of n, a(n) for n = 1..71 (next term is 8*10^1219 - 1)

CROSSREFS

Cf. A055558, A065582.

Sequence in context: A004618 A030433 A242550 * A090148 A287313 A136071

Adjacent sequences:  A141308 A141309 A141310 * A141312 A141313 A141314

KEYWORD

base,nonn

AUTHOR

Lekraj Beedassy, Aug 02 2008

EXTENSIONS

59999999 from Howard Berman (howard_berman(AT)hotmail.com), Apr 22 2009

Two more terms from Jon E. Schoenfield, Jan 12 2019

STATUS

approved

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Last modified June 13 17:14 EDT 2021. Contains 345008 sequences. (Running on oeis4.)