A062227 Numbers k such that the smoothly undulating palindromic number (91*10^k - 19)/99 is a prime.

3, 9, 11, 17, 23, 25229

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..6.

Patrick De Geest, SUPP Reference Table - 919

Index entries for sequences related to smoothly undulating palindromic primes

Example

k=23 -> (91*10^23 - 19)/99 = 91919191919191919191919.

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Sequence in context: A211864 A157139 A050538 * A111324 A107073 A227245

Adjacent sequences: A062224 A062225 A062226 * A062228 A062229 A062230

Keyword

nonn,base,more

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