A062214 Numbers k such that the smoothly undulating palindromic number(18*10^k - 81)/99 is a prime.

3, 5, 77, 163, 1479, 3657, 4573, 8315, 30259, 31063, 31855, 36915, 66657

Offset: 1

Author

Patrick De Geest and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), Jun 15 2001

Keywords

• nonn
• base

Comments

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

No further terms < 100000. - Ray Chandler, Aug 17 2011

Examples

			k=5 -> (18*10^5 - 81)/99 = 18181.
		

Links

• P. De Geest, SUPP Reference Table - 181
• Index entries for sequences related to smoothly undulating palindromic primes

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Extensions

a(13)=66657 from Ray Chandler, Jan 31 2011

Edited by Ray Chandler, Aug 17 2011