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n times n+5 gives the concatenation of two numbers m and m-6.
5

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

%S 8,9,98,99,361,635,712,921,998,999,8903,9998,9999,81816,99998,99999,

%T 336631,663365,999998,999999,7272725,9999998,9999999,76470587,

%U 99999998,99999999,333666331,405436666,428571427,447710183,454545452

%N n times n+5 gives the concatenation of two numbers m and m-6.

%Y Cf. A116118, A116236, A116248, A116250, A116255.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006