A116278 - OEIS

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

%S 7040,487249777145,512750222847,684330069116

%N n times n+9 gives the concatenation of two numbers m and m-2.

%e 7040 * 7049 = 4962//4960, where // denotes concatenation.

%Y Cf. A116147, A116271, A116277, A116284.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006