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A132050
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Denomintors of rationals which approximate Pi.
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2
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1, 5, 8, 61, 136, 1385, 3968, 50521, 176896, 2702765, 260096, 199360981, 951878656, 19391512145, 104932671488, 2404879675441, 14544442556416, 74074237647505, 2475749026562048, 69348874393137901, 507711943253426176
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,2
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COMMENTS
| Numerators are given in A132049.
See the Delahaye reference and a W. Lang link given in A132042.
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FORMULA
| a(n)=denominator(r(n)) with the rationals r(n):=2*n*e(n-1)/e(n) where e(n):=A000111(n).
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EXAMPLE
| Rationals r(n): [3, 16/5, 25/8, 192/61, 427/136, 4352/1385, 12465/3968, 158720/50521,...].
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CROSSREFS
| Cf. triangle A008281 (main diagonal give zig-zag numbers A000111).
Sequence in context: A117474 A165716 A068478 * A123819 A153720 A101016
Adjacent sequences: A132047 A132048 A132049 * A132051 A132052 A132053
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KEYWORD
| nonn,frac,easy
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AUTHOR
| Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Sep 14 2007
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