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Search: id:A108664
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| A108664 |
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In the decimal expansion of Pi, lengths of sublists ending with 9. |
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+0
1
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| 6, 7, 2, 16, 8, 4, 2, 1, 10, 3, 4, 17, 1, 20, 22, 7, 15, 25, 11, 7, 3, 3, 6, 9, 6, 33, 2, 10, 25, 10, 34, 3, 5, 5, 12, 3, 32, 3, 8, 15, 2, 2, 4, 11, 7, 19, 1, 5, 17, 5, 9, 2, 3, 26, 2, 4, 9, 7, 4, 11, 8, 22, 42, 3, 19, 6, 11, 11, 4, 3, 4, 8, 1, 8, 4, 14, 6, 9, 1, 14, 1, 1, 1, 1, 1, 5, 5, 1, 5, 11
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Take the decimal expansion of Pi: s={3,1,4,1,5,9,2,6,5,3,5,8,9,7,9,3,2,3,8,4,6,2,6,4,3,3,8,3,2,7,9,5,0,2,8,8,4}. Split s into sublists each ending with 9: {{3,1,4,1,5,9},{2,6,5,3,5,8,9},{7,9},{3,2,3,8,4,6,2,6,4,3,3,8,3,2,7,9},{5,0,2,8,8,4,1,9}}. The sequence gives the lengths of the sublists: 6,7,2,16,8,4,2,1,10,3,4,17,1,20,22,7. Cf. A053753 Positions of 9's in the decimal expansion of Pi.
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FORMULA
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a(n) = A053753(n+1)- A053753(n).
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CROSSREFS
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Cf. A053753, A108663.
Sequence in context: A070059 A088667 A153971 this_sequence A160155 A153628 A154972
Adjacent sequences: A108661 A108662 A108663 this_sequence A108665 A108666 A108667
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KEYWORD
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base,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Jun 17 2005
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