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Search: id:A066409
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| A066409 |
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Least positive integer not representable using exactly n 9's and the operations +-*/(). |
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+0
1
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OFFSET
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1,2
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LINKS
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Joe K. Crump, The 9 Nines
Index entries for similar sequences
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EXAMPLE
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a(4)=4 because 4 cannot be expressed with exactly 4 nines and the operations +-*/(). E.g. 1 = 9/9+9-9, 2 = 9/9+9/9, 3 = (9+9+9)/9, but 4 has no such representation.
138 = (((9 - (9 / ((9 + 9) + 9))) * (9 + 9)) - 9) - 9
265 = ((((9 - (9 / (9 + 9))) + 9) + 9) * ((9 * 9) + 9)) / 9
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CROSSREFS
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Sequence in context: A064297 A052661 A088624 this_sequence A006173 A102055 A162977
Adjacent sequences: A066406 A066407 A066408 this_sequence A066410 A066411 A066412
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KEYWORD
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more,nonn
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AUTHOR
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Joe K. Crump (joecr(AT)carolina.rr.com), Dec 24 2001
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EXTENSIONS
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Corrected by Leonhard Vogt (leonhard.vogt(AT)gmx.ch), Jan 09 2006
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