A062216 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A062216

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

1

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

(list; graph; refs; listen; history; text; internal format)

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