login
Numbers k such that k concatenated with itself gives the product of two numbers which differ by 1.
4

%I #6 Jul 20 2021 23:45:39

%S 132,406,510,852,7930,66942,113322,440056,5289256,58477510,111333222,

%T 164378892,183673470,200444410,206611570,224376732,277008310,

%U 297520662,305024040,326530612,353505556,444000556,479289942

%N Numbers k such that k concatenated with itself gives the product of two numbers which differ by 1.

%Y Cf. A116141, A116136, A116163, A116285.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006