A115533 - OEIS

%I #5 Jul 15 2021 06:29:39

%S 24489796,55102041,97959184,15976331361,28402366864,44378698225,

%T 63905325444,86982248521,

%U 24489795918367346938775510204081632653061224489796

%N Numbers k such that the concatenation of 3*k with k gives a square.

%e 73469388_24489796 = 85714286^2.

%Y Cf. A102567, A106497, A115527 - A115556.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Jan 25 2006