A062226 Numbers k such that the smoothly undulating palindromic number (79*10^k - 97)/99 is a prime.

3, 357, 537, 1677, 3057, 51663, 66447

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=357 -> (79*10^357 - 97)/99 = 7979797...7979797.
		

Links

• Patrick De Geest, SUPP Reference Table - 797
• Index entries for sequences related to smoothly undulating palindromic primes

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Extensions

a(6)=51663 from Ray Chandler, Nov 11 2010

a(7)=66447 from Ray Chandler, Jan 30 2011

Edited by Ray Chandler, Aug 17 2011