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%I #9 Jul 15 2021 09:14:24
%S 857143,1714286,857142857142857142857142857142857142857142857143,
%T 1714285714285714285714285714285714285714285714286
%N Numbers k such that k^2 is the concatenation of two numbers 6*m and m.
%e 857143^2 = 734694_122449.
%Y Cf. A102567, A106497, A115527 - A115556.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Jan 25 2006
%E Definition modified by _Georg Fischer_, Jul 26 2019