A062216 Numbers k such that the smoothly undulating palindromic number (31*10^k - 13)/99 is a prime.

3, 51, 83, 225, 561, 10419, 18255, 43869

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..8.

P. De Geest, SUPP Reference Table - 313

Index entries for sequences related to smoothly undulating palindromic primes

Example

k=51 -> (31*10^51 - 13)/99 = 313131313131313131313131313131313131313131313131313.

Crossrefs

Cf. A062209-A062232, A059758, A032758.

Sequence in context: A304701 A316452 A227069 * A305012 A316173 A316645

Adjacent sequences: A062213 A062214 A062215 * A062217 A062218 A062219

Keyword

nonn,base

Author

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

Extensions

43869 from Ray Chandler, Sep 30 2010

Edited by Ray Chandler, Aug 17 2011

Status

approved