A082716 Numbers k such that (72*10^(k-1) - 27)/9 is a plateau prime.
3, 5, 29, 157, 323, 353, 1213, 1285, 7985, 15193, 84773, 119931, 148861
Offset: 1
Examples
k=5 -> (72*10^(5-1) - 27)/9 = 79997.
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 - 797.
- Makoto Kamada, Prime numbers of the form 799...997.
- Index entries for primes involving repunits.
Formula
a(n) = A056263(n) + 2.
Extensions
a(11)=84773 from Ray Chandler, Jan 03 2011
a(12)=119931 from Ray Chandler, Apr 01 2011
a(13)=148861 from Ray Chandler, Apr 09 2011
Edited by Ray Chandler, Nov 04 2014
Comments