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).

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

Cf. A055558, A065582.

Sequence in context: A004618 A030433 A242550 * A090148 A348561 A287313

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