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A078510
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Spiro-Fibonacci numbers, a(n) = sum of two previous terms that are nearest when terms arranged in a spiral.
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6
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0, 1, 1, 1, 1, 1, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 21, 24, 27, 31, 36, 42, 48, 54, 61, 69, 78, 88, 98, 108, 119, 131, 144, 158, 172, 186, 201, 217, 235, 256, 280, 304, 328, 355, 386, 422, 464, 512, 560, 608, 662, 723, 792, 870, 958, 1056
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,9
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EXAMPLE
| Terms are written in square boxes radiating spirally (cf. Ulam prime spiral). a(0)=0 and a(1)=1, so write 0 and then 1 to its right. a(2) goes in the box below a(1). The nearest two filled boxes contain a(0) and a(1), so a(2)=a(0)+a(1)=0+1=1. a(3) goes in the box to the left of a(2). The nearest two filled boxes contain a(0) and a(2), so a(3)=a(0)+a(2)=0+1=1.
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CROSSREFS
| Cf. A000045, A063826.
Sequence in context: A032966 A122937 A060340 * A017909 A124695 A005555
Adjacent sequences: A078507 A078508 A078509 * A078511 A078512 A078513
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KEYWORD
| nonn
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AUTHOR
| N. Fernandez (primeness(AT)borve.org), Jan 05 2003
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