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A151546
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When computing A160256(n), it must be a multiple of a(n).
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2
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1, 2, 3, 2, 3, 8, 9, 8, 3, 2, 6, 1, 6, 5, 12, 5, 12, 1, 60, 7, 60, 7, 60, 7, 60, 7, 60, 7, 60, 1, 420, 11, 420, 11, 420, 11, 420, 11, 420, 11, 420, 11, 420, 11, 420, 22, 378, 55, 126, 55, 63, 220, 63, 440, 189, 880, 567, 880, 189, 220, 63, 55, 252, 275, 252, 275, 336, 275, 84, 275, 84
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,2
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COMMENTS
| In other words, a(n) = numerator of b(n-2)/b(n-1), where b() = A160256().
Then b(n) = smallest multiple of a(n) not already present in A160256.
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LINKS
| Alois P. Heinz, Table of n, a(n) for n = 3..10000
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MAPLE
| bb:= proc(n) option remember; false end: b:= proc(n) option remember; local k, m; if n<3 then bb(n):= true; n else m:= denom (b(n-1) /b(n-2)); for k from m by m while bb(k) do od; bb(k):= true; k fi end: a:= n-> numer (b(n-2) /b(n-1)): seq (a(n), n=3..100); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), May 17 2009]
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CROSSREFS
| Sequence in context: A076731 A085216 A102310 * A117936 A078331 A093868
Adjacent sequences: A151543 A151544 A151545 * A151547 A151548 A151549
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 16 2009
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