A062216 Numbers k such that the smoothly undulating palindromic number (31*10^k - 13)/99 is a prime.

3, 51, 83, 225, 561, 10419, 18255, 43869

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=51 -> (31*10^51 - 13)/99 = 313131313131313131313131313131313131313131313131313.
		

Links

• P. De Geest, SUPP Reference Table - 313
• Index entries for sequences related to smoothly undulating palindromic primes

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Extensions

43869 from Ray Chandler, Sep 30 2010

Edited by Ray Chandler, Aug 17 2011