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%I #13 Jul 18 2021 05:31:51
%S 6,96,385,429,567,611,814,996,4521,5475,9996,90910,99996,316832,
%T 683164,999996,3636364,6363632,9999996,82352942,99999996,331668332,
%U 368421053,395604391,442767754,461538462,488721800,511278196
%N Numbers k such that k*(k+5) gives the concatenation of a number m with itself.
%Y Cf. A028557, A020338.
%Y Cf. A116158, A116281, A116288, A116290, A116303.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006
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