A062212 Numbers k such that the smoothly undulating palindromic number (16*10^k - 61)/99 is a prime.

7, 55, 109, 145, 229, 961

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=7 -> (16*10^7 - 61)/99 = 1616161.
		

Links

• P. De Geest, SUPP Reference Table - 161
• Index entries for sequences related to smoothly undulating palindromic primes

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Extensions

Edited by Ray Chandler, Aug 17 2011