A062219 Numbers k such that the smoothly undulating palindromic number (37*10^k - 73)/99 is a prime.

3, 21, 27, 81, 315, 849, 1893, 2883, 9591, 14691

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..10.

P. De Geest, SUPP Reference Table - 373

Index entries for sequences related to smoothly undulating palindromic primes

Example

k=21 -> (37*10^21 - 73)/99 = 373737373737373737373.

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Sequence in context: A050586 A074217 A350247 * A091103 A363409 A292310

Adjacent sequences: A062216 A062217 A062218 * A062220 A062221 A062222

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