A062211 Numbers k such that the smoothly undulating palindromic number (15*10^k - 51)/99 is a prime.

3, 15, 63, 89, 245, 583, 1791, 2123, 7233, 24787, 44653

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=15 -> (15*10^15 - 51)/99 = 151515151515151.
		

Links

• P. De Geest, SUPP Reference Table - 151
• Index entries for sequences related to smoothly undulating palindromic primes

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Extensions

a(11)=44653 from Ray Chandler, Nov 11 2010

Edited by Ray Chandler, Aug 17 2011