A082707 Numbers k such that (32*10^(k-1) - 23)/9 is a plateau prime.
3, 9, 141, 231, 427, 463, 727, 1975, 7231, 45861, 47305
Offset: 1
Examples
k=9 -> (32*10^(9-1) - 23)/9 = 355555553.
References
- C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.
Links
- Patrick De Geest, PDP Reference Table - 353.
- Makoto Kamada, Prime numbers of the form 355...553.
- Index entries for primes involving repunits.
Formula
a(n) = A056254(n) + 2.
Extensions
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
Edited by Ray Chandler, Nov 05 2014
Comments