A082702 Numbers k such that (17*10^(k-1) - 71)/9 is a plateau prime.

3, 9, 15, 41, 93, 129, 885, 9425, 14769, 19259, 31235

Offset: 1

Author

Patrick De Geest, Apr 13 2003

Keywords

• nonn
• base
• more

Comments

Prime versus probable prime status and proofs are given in the author's table.

Examples

			k=15 -> (17*10^(15-1) - 71)/9 = 188888888888881.
		

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 - 181.
• Makoto Kamada, Prime numbers of the form 188...881.
• Index entries for primes involving repunits.

Crossrefs

Cf. A082697-A082720, A056249.

Formula

a(n) = A056249(n+1) + 2.

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008

Edited by Ray Chandler, Nov 04 2014