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Search: id:A120255
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| A120255 |
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Array read by rows, where the n-th row (of A120256(n) terms) lists the positive divisors, not occurring earlier in the array, of the n-th Fibonacci number. |
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+0
3
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| 1, 2, 3, 5, 4, 8, 13, 7, 21, 17, 34, 11, 55, 89, 6, 9, 12, 16, 18, 24, 36, 48, 72, 144, 233, 29, 377, 10, 61, 122, 305, 610, 47, 141, 329, 987, 1597, 19, 38, 68, 76, 136, 152, 323, 646, 1292, 2584, 37, 113, 4181, 15, 33, 41, 123, 165, 205, 451, 615, 1353, 2255, 6765, 26
(list; graph; listen)
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OFFSET
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2,2
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COMMENT
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A permutation of the natural numbers, ordered by A001177 and ties broken by the number itself. Inverse permutation is A119745. - Martin Fuller (martin_n_fuller(AT)btinternet.com), Sep 10 2006
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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Fibonacci(9) = 34; and the divisors of 34 are 1, 2, 17 and 34. Of these divisors, 1 and 2 occur earlier in the array.
So the 9th row of the array is [17, 34].
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MATHEMATICA
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f[t_] := Append[t, Select[Divisors[Fibonacci[Length[t] + 1]], FreeQ[Flatten[t], # ] &]]; Flatten@Nest[f, {}, 20] (*Chandler*)
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CROSSREFS
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Cf. A120256, A001177, A119745.
Sequence in context: A096070 A075157 A046708 this_sequence A059450 A060000 A074050
Adjacent sequences: A120252 A120253 A120254 this_sequence A120256 A120257 A120258
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KEYWORD
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nonn,tabf
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AUTHOR
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Leroy Quet Jun 13 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 14 2006
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