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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 4415,5577,7840,3188375836088211088457055570,

%T 4940200653606459263639537322,5059799346393540736360462670,

%U 6811624163911788911542944422,6977607565571622928141284588

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

%e 7840 * 7849 = 6153//6160, where // denotes concatenation.

%Y Cf. A116211, A116334, A116341, A116347.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006