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Search: id:A064809
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| A064809 |
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Decimal expansion of Pi written as a sequence of natural numbers avoiding duplicates. |
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+0
1
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| 3, 1, 4, 15, 9, 2, 6, 5, 35, 8, 97, 93, 23, 84, 62, 64, 33, 83, 27, 950, 28, 841, 971, 69, 39, 937, 510, 58, 20, 974, 94, 45, 92, 30, 7, 81, 640, 628, 620, 89, 98, 6280, 34, 82, 53, 42, 11, 70, 67, 982, 14, 80, 86, 51, 32, 8230, 66, 470, 938, 44, 60, 95, 50, 582, 231, 72
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Start with the first digit of Pi and set a(1)=3. Let p(1),...,p(i), be the digits of Pi used to construct a(1),...,a(n); then a(n+1) is the smallest integer with digits p(i+1),..,p(i+j) such that a(n+1) is new and p(i+j+1) not= 0.
Is the sequence is a permutation of the natural numbers?
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EXAMPLE
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Pi=3.141592653589...
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CROSSREFS
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Cf. A000796.
Sequence in context: A010284 A095328 A066712 this_sequence A058361 A112668 A016734
Adjacent sequences: A064806 A064807 A064808 this_sequence A064810 A064811 A064812
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KEYWORD
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base,nonn
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AUTHOR
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Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Oct 22 2001
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