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%I #8 Jul 15 2021 06:28:42
%S 5714285714285714286,8571428571428571429,11428571428571428572,
%T 465116279069767441860465116279070,511627906976744186046511627906977,
%U 558139534883720930232558139534884,604651162790697674418604651162791
%N Numbers k such that k^2 is the concatenation of two numbers 2*m and m.
%e 5714285714285714286^2 = 3265306122448979592_1632653061224489796.
%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 25 2019