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Search: id:A057680
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| A057680 |
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Self-locating strings within Pi: numbers n such that the string n is at position n (after the decimal point) in decimal digits of Pi. |
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+0
13
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OFFSET
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1,2
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COMMENT
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The next term is greater than 10^8. - Colin Rose (colin(AT)tri.org.au), Mar 15 2006
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REFERENCES
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Clifford A. Pickover, A Passion for Mathematics, Wiley, 2005; see p. 60.
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LINKS
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David G. Andersen, The Pi-Search Page.
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EXAMPLE
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1 is a term because 1 is the first digit after the decimal point
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MATHEMATICA
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StringsinPiAfterPoint[m_] := Module[{cc = 10^m + m, sol, aa}, sol = Partition[RealDigits[Pi, 10, cc] // First // Rest, m, 1]; Do[aa = FromDigits[sol[[i]]]; If[aa==i, Print[{i, aa}]], {i, Length[sol]}]; ] For example, StringsinPiAfterPoint[5] returns all 5-digit members of the sequence. - Colin Rose (colin(AT)tri.org.au), Mar 15 2006
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CROSSREFS
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Cf. A057679, A109513.
Sequence in context: A133533 A076166 A031829 this_sequence A157796 A091089 A109028
Adjacent sequences: A057677 A057678 A057679 this_sequence A057681 A057682 A057683
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KEYWORD
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nonn,base,more
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AUTHOR
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Mike Keith (domnei(AT)aol.com), Oct 19 2000
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EXTENSIONS
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More terms from Colin Rose (colin(AT)tri.org.au), Mar 15 2006
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