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n times n+9 gives the concatenation of two numbers m and m+8.
4

%I #2 Mar 30 2012 17:40:41

%S 345,647,829,878,933,33180,42271,57721,66812,316429537030539,

%T 319485532390187,328611858418903,332707864512186,339600869407914,

%U 347417506407134,355879196889561,370588838784509,383811170906508

%N n times n+9 gives the concatenation of two numbers m and m+8.

%e 66812 * 66821 = 44644//44652, where // denotes concatenation.

%Y Cf. A116216, A116342, A116346, A116355.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006