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Search: id:A105448
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| A105448 |
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Positive integers whose representation as Roman Fibonacci numbers has exactly three symbols. |
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+0
4
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| 17, 25, 27, 28, 30, 38, 40, 41, 43, 44, 45, 46, 48, 49, 51, 59, 61, 62, 64, 65, 66, 67, 69, 70, 71, 72, 73, 74, 75, 77, 78, 79, 82, 83, 85, 93, 95, 96, 98, 99, 100, 101, 103, 104, 105, 107, 108, 109, 111, 112, 113, 115, 118, 124, 125, 126, 128, 132, 133, 134, 136, 140
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A105446 gives the number of symbols in Roman Fibonacci numbers. A105447 gives positive integers whose representation as Roman Fibonacci numbers has exactly two symbols. A105449 gives positive integers whose representation as Roman Fibonacci numbers has exactly four symbols. A105450 gives positive integers whose representation as Roman Fibonacci numbers has exactly five symbols.
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FORMULA
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a(n) is an element of A105447 iff A105446(n) = 3.
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EXAMPLE
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In Roman Fibonacci number representation:
17 = "A22", 25 = "B22", 27 = "AA1", 28 = "AA2", 30 = "B81", 38 = "C22", 40 = "C33", 41 = "C52", 43 = "BB1", 44 = "BB2", 45 = "BB3", 46 = "1CA", 48 = "CA1", ..., 155 = "2FA", 156 = "1FA", 158 = "FA1", 159 = "FA2", 160 = "FA3".
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CROSSREFS
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Cf. A000045, A006968, A105446, A105447, A105449-A105455.
Sequence in context: A158803 A051780 A124971 this_sequence A082130 A140609 A131275
Adjacent sequences: A105445 A105446 A105447 this_sequence A105449 A105450 A105451
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KEYWORD
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base,easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Apr 09 2005
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