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A062212
Numbers k such that the smoothly undulating palindromic number (16*10^k - 61)/99 is a prime.
0
7, 55, 109, 145, 229, 961
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=7 -> (16*10^7 - 61)/99 = 1616161.
CROSSREFS
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