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Numbers k such that k concatenated with itself gives the product of two numbers which differ by 6.
5

%I #6 Jul 20 2021 23:45:51

%S 5,95,216,287,515,675,995,1175,4320,9995,82640,99995,960795,999995,

%T 1322312,4049591,9999995,16955015,34602080,99999995,171010235,

%U 181964891,183673467,187160072,321920055,326530616,328818032

%N Numbers k such that k concatenated with itself gives the product of two numbers which differ by 6.

%Y Cf. A115429, A116158, A116160, A116173, A116290.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006