Search: id:A082698
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%I A082698
%S A082698 7,67,1255,8407,67039
%N A082698 Plateau and depression primes of the form 4*(10^a(n)-1)/9-3*(10^[ a(n)-1 
               ]+1) or (13*10^[ a(n)-1 ]-31)/9.
%C A082698 Prime versus probable prime status and proofs are given in the author's 
               table.
%D A082698 C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 
               28, No. 1, 1996-97, pp. 1-9.
%H A082698 P. De Geest, <a href="http://www.worldofnumbers.com/deplat.htm">PDP Reference 
               Table</a>
%e A082698 a(n)=7 -> 4*(10^7-1)/9-3*(10^6+1) = 1444441.
%Y A082698 Cf. A082697 up to A082720.
%Y A082698 Sequence in context: A020469 A038386 A082578 this_sequence A093170 A120079 
               A087567
%Y A082698 Adjacent sequences: A082695 A082696 A082697 this_sequence A082699 A082700 
               A082701
%K A082698 nonn,base
%O A082698 0,1
%A A082698 Patrick De Geest (pdg(AT)worldofnumbers.com), Apr 13 2003.
%E A082698 A new PRP term from Serge Batalov (batalovs(AT)yahoo.com), Nov 02 2008

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