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A055611
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n written efficiently in natural numbers base, i.e. in form ...wxyz where n=1*z+2*y+3*x+4*w+... with z<=1, y<2, x<3, w<4, ...
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1
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1, 10, 11, 101, 110, 111, 201, 210, 211, 1111, 1201, 1210, 1211, 2111, 2201, 2210, 2211, 3111, 3201, 3210, 3211, 12211, 13111, 13201, 13210, 13211, 22211, 23111, 23201, 23210, 23211, 32211, 33111, 33201, 33210, 33211, 42211, 43111, 43201
(list; graph; refs; listen; history; internal format)
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