%I #7 Jul 17 2021 01:44:44

%S 8217108,8030443878983905982,

%T 43467818511541680701794365325328847002052,

%U 56532181488458319298205634674671152997945

%N Numbers k such that k*(k+4) gives the concatenation of two numbers m and m+7.

%e 8217108 * 8217112 = 6752089//6752096, where // denotes concatenation.

%Y Cf. A116173, A116323, A116336, A116338, A116350.

%Y Cf. A116304, A116257.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006