%I #7 Jul 18 2021 02:55:38
%S 82,77394228,89158934,36623663376237623663376336,
%T 37633762366336633762366236,62366237633663366237633762,
%U 63376336623762376336623662,86194223018927804587702129
%N Numbers k such that k*(k+3) gives the concatenation of two numbers m and m+1.
%e 89158934 * 89158937 = 79493157//79493158, where // denotes concatenation.
%Y Cf. A116099, A116287, A116295, A116297, A116302.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006