A116226 n times n+2 gives the concatenation of two numbers m and m-9.
4622, 5377, 7980, 34952, 46865, 53134, 65047, 7056186, 9783459, 43176670, 56823329, 97999800, 447255476452, 552744523547, 755424659534, 799319866013, 997999998000, 4297663349523, 5702336650476, 6971253996227
Offset: 1
Examples
97999800 * 97999802 = 96039609//96039600, where // denotes concatenation.
Links
- Robert Israel, Table of n, a(n) for n = 1..1122
Programs
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Maple
A:= NULL: count:= 0: for d from 2 to 40 do R:= [msolve(x^2=-8,10^d+1)]; T:= sort(select(t -> t*(t+2) mod 10^d >= 10^(d-1), map(t -> subs(t,x-1),R))); count:= count+nops(T); A:= A, op(T); od: A; # Robert Israel, Jan 04 2021