A062226 Numbers k such that the smoothly undulating palindromic number (79*10^k - 97)/99 is a prime.

3, 357, 537, 1677, 3057, 51663, 66447

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..7.

Patrick De Geest, SUPP Reference Table - 797

Index entries for sequences related to smoothly undulating palindromic primes

Example

k=357 -> (79*10^357 - 97)/99 = 7979797...7979797.

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Sequence in context: A341229 A157591 A005336 * A266454 A288948 A297483

Adjacent sequences: A062223 A062224 A062225 * A062227 A062228 A062229

Keyword

nonn,base,more

Author

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

Extensions

a(6)=51663 from Ray Chandler, Nov 11 2010

a(7)=66447 from Ray Chandler, Jan 30 2011

Edited by Ray Chandler, Aug 17 2011

Status

approved