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A039392
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Numbers whose base-9 representation has the same nonzero number of 7's and 8's.
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0
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71, 79, 152, 160, 233, 241, 314, 322, 395, 403, 476, 484, 557, 565, 575, 584, 593, 602, 611, 620, 629, 639, 640, 641, 642, 643, 644, 645, 655, 664, 673, 682, 691, 700, 709, 711, 712, 713, 714, 715, 716, 717, 800, 808, 881, 889, 962, 970, 1043, 1051
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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b9Q[n_]:=Module[{idn9=IntegerDigits[n, 9]}, Count[idn9, 7]==Count[idn9, 8]!=0]
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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