login
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
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
Sequence in context: A004618 A030433 A242550 * A090148 A348561 A287313
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