login
A062224
Numbers k such that the smoothly undulating palindromic number (75*10^k - 57)/99 is a prime.
0
3, 17, 77, 143, 149, 513, 1079, 1415, 6249, 13265, 14579, 15293, 41657, 72941
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=17 -> (75*10^17 - 57)/99 = 75757575757575757.
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Patrick De Geest and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), Jun 15 2001
EXTENSIONS
a(13)=41657 from Ray Chandler, Nov 11 2010
a(14)=72941 from Ray Chandler, Mar 24 2011
Edited by Ray Chandler, Aug 17 2011
STATUS
approved