Search: id:A082697
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%I A082697
%S A082697 3,5,7,95,161,361,1471,2899,3095,3113,15699,17957
%N A082697 Plateau and depression primes of the form (10^a(n)-1)/3-2*(10^[ a(n)-1 
               ]+1) or (12*10^[ a(n)-1 ]-21)/9 or 4*(10^[ a(n)-1 ]-1)/3-1.
%C A082697 Prime versus probable prime status and proofs are given in the author's 
               table.
%D A082697 C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 
               28, No. 1, 1996-97, pp. 1-9.
%H A082697 P. De Geest, <a href="http://www.worldofnumbers.com/deplat.htm">PDP Reference 
               Table</a>
%e A082697 a(n)=7 -> (10^7-1)/3-2*(10^6+1) = 1333331.
%Y A082697 Cf. A082698 up to A082720.
%Y A082697 Sequence in context: A119939 A153138 A160360 this_sequence A051345 A104388 
               A110337
%Y A082697 Adjacent sequences: A082694 A082695 A082696 this_sequence A082698 A082699 
               A082700
%K A082697 nonn,base
%O A082697 0,1
%A A082697 Patrick De Geest (pdg(AT)worldofnumbers.com), Apr 13 2003.

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