A055617 - OEIS

A055617

a(n)= A*10^(3*n)+B with A=(10^(3*n)-10^n) and B=10^(2*n).

%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)