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n times n+9 gives the concatenation of two numbers m and m-7.
4

%I #2 Mar 30 2012 17:40:40

%S 8,698,775,789,866,42336,57656,96882,44121665,55878327,85298136,

%T 36680703009575609347721358492,63319296990424390652278641500,

%U 69346342454876071597336150480,81501115172242572470460459682

%N n times n+9 gives the concatenation of two numbers m and m-7.

%e 85298136 * 85298145 = 72757727//72757720, where // denotes

%e concatenation.

%Y Cf. A116114, A116240, A116244, A116258.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006