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A062232 Numbers k such that the smoothly undulating palindromic number (98*10^k - 89)/99 is a prime. 24
9, 161, 219, 4859, 21989, 52931, 88595 (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..7.

Patrick De Geest, SUPP Reference Table - 989

Index entries for sequences related to smoothly undulating palindromic primes

EXAMPLE

k=9 -> (98*10^9 - 89)/99 = 989898989.

CROSSREFS

Cf. A062209-A062231, A059758, A032758.

Sequence in context: A060348 A217392 A327978 * A337627 A020523 A023039

Adjacent sequences:  A062229 A062230 A062231 * A062233 A062234 A062235

KEYWORD

nonn,base,more

AUTHOR

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

EXTENSIONS

a(6)=52931 from Ray Chandler, Nov 11 2010

a(7)=88595 from Ray Chandler, Jul 23 2011

Edited by Ray Chandler, Aug 17 2011

STATUS

approved

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Last modified May 15 02:21 EDT 2021. Contains 343909 sequences. (Running on oeis4.)