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%I #11 Jun 30 2021 03:54:48
%S 12,21,102,120,123,124,125,126,127,128,129,132,142,152,162,172,182,
%T 192,201,210,213,214,215,216,217,218,219,231,241,251,261,271,281,291,
%U 312,321,412,421,512,521,612,621,712,721,812,821,912,921,1002,1020
%N Numbers whose base-10 representation has the same nonzero number of 1's and 2's.
%K nonn,base,easy
%O 1,1
%A _Olivier Gérard_
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