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Numbers k such that the concatenation of k with 6*k gives a square.
0

%I #7 Jul 15 2021 09:15:25

%S 1,20408163265306122448979591836734694,

%T 81632653061224489795918367346938776,

%U 20408163265306122448979591836734693877551020408163265306122448979591836734694

%N Numbers k such that the concatenation of k with 6*k gives a square.

%e 1_6 = 4^2.

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

%K nonn,base,less

%O 1,2

%A _Giovanni Resta_, Jan 25 2006