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Search: id:A122597
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| A122597 |
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a(0) = 1, a(1) = 2, s = 1; for n >= 2, if a(n-1) is even and s = 0 then set a(n) = a(n-1)/2 and s = 1; otherwise set a(n) = a(n-1) + a(n-2) and s = 0. |
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+0
2
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| 1, 2, 3, 5, 8, 4, 12, 6, 18, 9, 27, 36, 18, 54, 27, 81, 108, 54, 162, 81, 243, 324, 162, 486, 243, 729, 972, 486, 1458, 729, 2187, 2916, 1458, 4374, 2187, 6561, 8748, 4374, 13122, 6561, 19683, 26244, 13122, 39366, 19683, 59049, 78732, 39366, 118098, 59049
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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For n >= 6, a(n) = A122164(n+5), so there is an explicit formula for the n-th term.
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MAPLE
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a:= n-> if n<=5 then [1, 2, 3, 5, 8, 4][n+1] else [2, 1, 3, 4, 2][modp(n+2, 5)+1] *3^iquo(n+2, 5) fi: seq (a(n), n=0..50); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Sep 02 2008]
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CROSSREFS
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Cf. A000045, A122164, A000792.
Adjacent sequences: A122594 A122595 A122596 this_sequence A122598 A122599 A122600
Sequence in context: A104205 A021428 A050196 this_sequence A105836 A105822 A011158
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KEYWORD
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nonn
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AUTHOR
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njas, Aug 06 2008
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EXTENSIONS
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More terms from Alois P. Heinz (heinz(AT)hs-heilbronn.de), Sep 02 2008
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