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Numbers k such that k^2 is the concatenation of two numbers m and 3*m.
0

%I #10 Jul 15 2021 06:29:11

%S 2857142857142857142857142857142858,

%T 4285714285714285714285714285714287,

%U 5714285714285714285714285714285716,19354838709677419354838709677419354838709677419354838709678

%N Numbers k such that k^2 is the concatenation of two numbers m and 3*m.

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

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Jan 25 2006