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%I #10 Jul 23 2013 03:52:56
%S 990100,999900010000,999999000001000000,999999990000000100000000,
%T 999999999900000000010000000000,999999999999000000000001000000000000,
%U 999999999999990000000000000100000000000000
%N a(n)= A*10^(3*n)+B with A=(10^(3*n)-10^n) and B=10^(2*n).
%e a(2) = (10^6-10^2)*10^6+10^4 = 999900010000.
%e Note that 999900010000 = 999900^2 + 010000^2 (see A055616).
%o (PARI) a(n) = (10^(3*n)-10^n)*10^(3*n) + 10^(2*n) \\ _Michel Marcus_, Jul 23 2013
%Y Subsequence of A055616.
%K nonn,easy
%O 1,1
%A Ulrich Schimke (ulrschimke(AT)aol.com)
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