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 A105448 Positive integers whose representation as Roman Fibonacci numbers has exactly three symbols. 4
 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; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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. LINKS FORMULA a(n) is an element of A105447 iff A105446(n) = 3. EXAMPLE 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". CROSSREFS Cf. A000045, A006968, A105446, A105447, A105449-A105455. Sequence in context: A051780 A124971 A272635 * A336007 A082130 A140609 Adjacent sequences:  A105445 A105446 A105447 * A105449 A105450 A105451 KEYWORD base,easy,nonn AUTHOR Jonathan Vos Post, Apr 09 2005 STATUS approved

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Last modified May 10 05:00 EDT 2021. Contains 343748 sequences. (Running on oeis4.)