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A256291
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Numbers which have only digits 5 and 6 in base 10.
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17
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5, 6, 55, 56, 65, 66, 555, 556, 565, 566, 655, 656, 665, 666, 5555, 5556, 5565, 5566, 5655, 5656, 5665, 5666, 6555, 6556, 6565, 6566, 6655, 6656, 6665, 6666, 55555, 55556, 55565, 55566, 55655, 55656, 55665, 55666, 56555, 56556
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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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FORMULA
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MATHEMATICA
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Flatten[Table[FromDigits[#, 10]&/@Tuples[{5, 6}, n], {n, 5}]]
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PROG
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(Magma) [n: n in [1..60000] | Set(IntegerToSequence(n, 10)) subset {5, 6}];
(PARI) A256291(n)=vector(#n=binary(n+1)[2..-1], i, 10^(#n-i))*n~+10^#n\9*5
(Magma) [n: n in [1..100000] | Set(Intseq(n)) subset {5, 6}]; // :Vincenzo Librandi_, Aug 19 2016
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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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