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Numbers k such that k^2 is the concatenation of two numbers 5*m and m.
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%I #9 Jul 15 2021 09:15:17

%S 7142857142857142857143,14285714285714285714286,

%T 21428571428571428571429,

%U 730337078651685393258426966292134831460674157303370786517

%N Numbers k such that k^2 is the concatenation of two numbers 5*m and m.

%e 7142857142857142857143^2 = 5102040816326530612245_1020408163265306122449.

%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