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%I #7 Jul 17 2021 01:44:22
%S 28,72,79822845,69852478553064869297984899963807,
%T 77473062193002372448027740546439,77747359197583788609974143907619,
%U 84341826458653210947638195982115,85367942837521291760016984490251
%N Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+4.
%e 79822845 * 79822846 = 63716866//63716870, where // denotes concatenation.
%Y Cf. A116171, A116307, A116315, A116322.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006
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