A062215 Numbers k such that the smoothly undulating palindromic number (19*10^k - 91)/99 is a prime.

3, 33, 133, 1969, 2335

Offset

1,1

Comments

Prime versus probable prime status and proofs are given in the author's table.

No further terms < 100000. - Ray Chandler, Aug 17 2011

Links

Table of n, a(n) for n=1..5.

P. De Geest, SUPP Reference Table - 191

Index entries for sequences related to smoothly undulating palindromic primes

Example

k=33 -> (19*10^33 - 91)/99 = 191919191919191919191919191919191.

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Sequence in context: A089015 A292453 A292733 * A279885 A132122 A203560

Adjacent sequences: A062212 A062213 A062214 * A062216 A062217 A062218

Keyword

nonn,base

Author

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

Extensions

Edited by Ray Chandler, Aug 17 2011

Status

approved