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

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

%S 80,77394226,89158932,36623663376237623663376334,

%T 37633762366336633762366234,62366237633663366237633760,

%U 63376336623762376336623660,86194223018927804587702127

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

%e 89158932 * 89158939 = 79493157//79493148, where // denotes

%e concatenation.

%Y Cf. A116099, A116229, A116231, A116238.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006