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%I #7 Jul 17 2021 01:44:05
%S 452,547,690,855,4381,5618,72729,346532,653467,9090907,94117645,
%T 334665332,336032386,378253327,390977441,439928490,483516485,
%U 516483514,560071509,609022558,621746672,663967613,665334667
%N Numbers k such that k*(k+2) is the concatenation of two numbers m and m+3.
%Y Cf. A116177, A116295, A116307, A116309, A116315.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006