A062224 Numbers k such that the smoothly undulating palindromic number (75*10^k - 57)/99 is a prime.

3, 17, 77, 143, 149, 513, 1079, 1415, 6249, 13265, 14579, 15293, 41657, 72941

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=17 -> (75*10^17 - 57)/99 = 75757575757575757.
		

Links

• Patrick De Geest, SUPP Reference Table - 757
• Index entries for sequences related to smoothly undulating palindromic primes

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Extensions

a(13)=41657 from Ray Chandler, Nov 11 2010

a(14)=72941 from Ray Chandler, Mar 24 2011

Edited by Ray Chandler, Aug 17 2011