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%I #6 Feb 13 2018 11:03:47
%S 428571428571428571429,571428571428571428572,857142857142857142858,
%T 363636363636363636363636363636364,454545454545454545454545454545455,
%U 545454545454545454545454545454546,636363636363636363636363636363637
%N Numbers with pandigital biperiod squares.
%D R. Ondrejka, Problem 1130: Biperiod Squares, Journal of Recreational Mathematics, Vol. 14:4 (1981-82), 299. Solution by F. H. Kierstead, Jr., JRM, Vol. 15:4 (1982-83), 311-312.
%Y Cf. A106497, A181789, A181790.
%K nonn,base
%O 1,1
%A _William Rex Marshall_, Nov 12 2010
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