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A169964
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Numbers whose decimal expansion contains only 0's and 5's.
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17
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0, 5, 50, 55, 500, 505, 550, 555, 5000, 5005, 5050, 5055, 5500, 5505, 5550, 5555, 50000, 50005, 50050, 50055, 50500, 50505, 50550, 50555, 55000, 55005, 55050, 55055, 55500, 55505, 55550, 55555, 500000, 500005, 500050, 500055, 500500, 500505, 500550, 500555
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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Map[FromDigits, Tuples[{0, 5}, 6]] (* Paolo Xausa, Oct 30 2023 *)
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PROG
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(PARI) print1(0); for(d=1, 5, for(n=2^(d-1), 2^d-1, print1(", "); forstep(i=d-1, 0, -1, print1((n>>i)%2*5)))) \\ Charles R Greathouse IV, Nov 16 2011
(Haskell)
a169964 n = a169964_list !! (n-1)
a169964_list = map (* 5) a007088_list
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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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