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A039436
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Numbers whose base-10 representation has the same nonzero number of 7's and 9's.
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1
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79, 97, 179, 197, 279, 297, 379, 397, 479, 497, 579, 597, 679, 697, 709, 719, 729, 739, 749, 759, 769, 789, 790, 791, 792, 793, 794, 795, 796, 798, 879, 897, 907, 917, 927, 937, 947, 957, 967, 970, 971, 972, 973, 974, 975, 976, 978, 987, 1079, 1097
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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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Select[Range[1100], DigitCount[#, 10, 7]==DigitCount[#, 10, 9]>0&] (* Harvey P. Dale, Aug 30 2020 *)
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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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