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A062211
Numbers k such that the smoothly undulating palindromic number (15*10^k - 51)/99 is a prime.
0
3, 15, 63, 89, 245, 583, 1791, 2123, 7233, 24787, 44653
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
EXAMPLE
k=15 -> (15*10^15 - 51)/99 = 151515151515151.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), Jun 15 2001
EXTENSIONS
a(11)=44653 from Ray Chandler, Nov 11 2010
Edited by Ray Chandler, Aug 17 2011
STATUS
approved