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n times n+9 gives the concatenation of a number m with itself.
4

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

%S 2,92,420,572,693,728,992,9855,9992,36355,63637,99992,970298,999992,

%T 4545455,5454537,9999992,88235295,99999992,351069983,403018035,

%U 493927126,506072866,596981957,648930009,736842097,739839100

%N n times n+9 gives the concatenation of a number m with itself.

%Y Cf. A116162, A116284, A116292, A116300.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006