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%I #20 Aug 07 2019 14:23:05
%S 10,100,101,102,12,21,112,120,103,30,130,104,14,41,114,124,121,122,
%T 123,23,32,132,125,25,52,152,126,16,61,106,105,50,150,107,70,170,108,
%U 18,81,118,128,127,27,72,172,129,29,92,192,142,134,34,43,143,140,109,90,190,110,160,116
%N Set a(1)=10. Thereafter a(n) is the smallest positive number not yet in the sequence that contains exactly one even digit and one odd digit from a(n-1).
%C Numbers such as 3, 8, 20, 31, and 42 are not in the sequence since by definition all terms must contain both odd and even digits.
%e a(2)=100 since it is the smallest number not yet in the sequence that contains an even digit (0) and an odd digit (1) from a(1)=10.
%e a(7)=112 since it is the smallest number not yet in the sequence that contains an even digit (2) and an odd digit (1) from a(6)=21.
%e a(27)=126 is not 105 since 105 would contain two odd digits (1 and 5) from a(26)=152.
%Y Cf. A318700 (positive numbers that contain both odd and even digits).
%K nonn,base
%O 1,1
%A _Enrique Navarrete_, Jul 27 2019
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