%I A062209
%S A062209 7,11,43,139,627,1399,1597,1979,7809,14059
%N A062209 Smoothly undulating palindromic primes of the form (12*10^a(n)-21)/99.
%C A062209 Prime versus probable prime status and proofs are given in the author's 
               table.
%D A062209 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 139, p. 48, Ellipses, 
               Paris 2008.
%H A062209 P. De Geest, <a href="http://www.worldofnumbers.com/undulat.htm">SUPP 
               Reference Table</a>
%e A062209 a(n)=11 --> (12*10^11-21)/99 = 12121212121.
%Y A062209 Cf. A062210-A062232, A059758, A032758.
%Y A062209 Sequence in context: A138122 A129865 A153377 this_sequence A086828 A117392 
               A105867
%Y A062209 Adjacent sequences: A062206 A062207 A062208 this_sequence A062210 A062211 
               A062212
%K A062209 nonn,base
%O A062209 0,1
%A A062209 Patrick De Geest (pdg(AT)worldofnumbers.com) and Hans Rosenthal (Hans.Rosenthal(AT)t-online.de), 
               Jun 15 2001.