A062227 Numbers k such that the smoothly undulating palindromic number (91*10^k - 19)/99 is a prime.

3, 9, 11, 17, 23, 25229

Offset: 1

Author

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

Keywords

• nonn
• base
• more

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=23 -> (91*10^23 - 19)/99 = 91919191919191919191919.
		

Links

• Patrick De Geest, SUPP Reference Table - 919
• Index entries for sequences related to smoothly undulating palindromic primes

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Extensions

Edited by Ray Chandler, Aug 17 2011