A319723 Write n in 6-ary, sort digits into decreasing order.
0, 1, 2, 3, 4, 5, 6, 7, 13, 19, 25, 31, 12, 13, 14, 20, 26, 32, 18, 19, 20, 21, 27, 33, 24, 25, 26, 27, 28, 34, 30, 31, 32, 33, 34, 35, 36, 42, 78, 114, 150, 186, 42, 43, 79, 115, 151, 187, 78, 79, 85, 121, 157, 193, 114, 115, 121, 127, 163, 199, 150, 151, 157, 163
Offset: 0
Links
- Seiichi Manyama, Table of n, a(n) for n = 0..7775
Crossrefs
Programs
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Mathematica
Table[FromDigits[ReverseSort[IntegerDigits[n, 6]], 6], {n, 0, 100}] (* Paolo Xausa, Aug 07 2024 *)
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PARI
a(n) = fromdigits(vecsort(digits(n, 6), , 4), 6); \\ Michel Marcus, Sep 26 2018
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Ruby
def A(k, n) (0..n).map{|i| i.to_s(k).split('').sort.reverse.join.to_i(k)} end p A(6, 100)
Formula
n <= a(n) < 6n. - Charles R Greathouse IV, Aug 07 2024