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Numbers k such that k concatenated with itself gives the product of two numbers which differ by 8.
5

%I #6 Jul 20 2021 23:46:13

%S 3,93,145,384,505,820,993,7680,9993,20665,29748,99993,480340,999993,

%T 6694209,9999993,77854665,99999993,107541513,109342209,132231408,

%U 174990384,183673473,213017748,289940833,326530608,338353345

%N Numbers k such that k concatenated with itself gives the product of two numbers which differ by 8.

%Y Cf. A116146, A116160, A116162, A116168, A116292.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006