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A062219
Numbers k such that the smoothly undulating palindromic number (37*10^k - 73)/99 is a prime.
0
3, 21, 27, 81, 315, 849, 1893, 2883, 9591, 14691
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=21 -> (37*10^21 - 73)/99 = 373737373737373737373.
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