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A292457
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Numbers where 7 outnumbers any other digit.
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20
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7, 77, 177, 277, 377, 477, 577, 677, 707, 717, 727, 737, 747, 757, 767, 770, 771, 772, 773, 774, 775, 776, 777, 778, 779, 787, 797, 877, 977, 1077, 1277, 1377, 1477, 1577, 1677, 1707, 1727, 1737, 1747, 1757, 1767, 1770, 1772, 1773, 1774, 1775, 1776, 1777
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OFFSET
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1,1
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LINKS
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EXAMPLE
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707 has more 7's than any other digit, whereas 7007 has as many 0's as 7's.
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MATHEMATICA
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Select[Range[0, 2000], Max@ #1 < First@ #2 & @@ TakeDrop[RotateLeft[#, 7] &@ DigitCount@ #, 9] &] (* Michael De Vlieger, Sep 18 2017 *)
Select[Range[2000], Max[Drop[DigitCount[#], {7}]]<DigitCount[#, 10, 7]&] (* Harvey P. Dale, Oct 07 2023 *)
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PROG
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(PARI) isok(n) = {d = digits(n); v = vector(10, n, #select(x->x==(n-1), d)); for (k=1, #v, if ((k != 8) && (v[k] >= v[8]), return(0)); ); return(1); } \\ Michel Marcus, Sep 21 2017
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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