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Search: id:A155912
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| A155912 |
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Let d(i) be the i-th digit of the decimal expansion of Pi = 3.1415926535897932384626433832795..., so that d(0) = 3, d(1) = 1, d(2) = 4, etc. Then a(0) = 3, a(n) = d(d(n)) for n>0. |
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+0
3
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| 3, 1, 5, 1, 9, 3, 4, 2, 9, 1, 9, 5, 3, 6, 3, 1, 4, 1, 5, 5, 2, 4, 2, 5, 1, 1, 5, 1, 4, 6, 3, 9, 3, 4, 5, 5, 5, 1, 3, 6, 1, 2, 3, 1, 3, 3, 1, 6, 9, 1, 3, 9, 5, 4, 3, 3, 6, 5, 3, 5, 5, 9, 3, 4, 1, 3, 6, 5, 1, 2, 5, 3, 2, 4, 5, 2, 4, 3, 5, 3, 3, 5, 2, 4, 5, 3, 1, 5, 5, 4, 9, 1, 5, 4, 1, 1, 6, 3, 2, 6, 3, 5, 4, 1, 5
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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This defines a constant 3.151934291953631... related to Pi in a peculiar way!
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LINKS
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Zak Seidov, Table of n, a(n) for n = 0..999
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MATHEMATICA
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id = Rest@ RealDigits[ Pi, 10, 105][[1]]; id[[0]] = 3; id[[ id[[ 0]]]] = 3; Table[id[[ id[[ n]]]], {n, 0, 104}] [From Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 17 2009]
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CROSSREFS
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Cf. A135725.
Cf. A119505. [From Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 17 2009]
Sequence in context: A050329 A147005 A051707 this_sequence A050354 A146434 A126213
Adjacent sequences: A155909 A155910 A155911 this_sequence A155913 A155914 A155915
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KEYWORD
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nonn,base
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AUTHOR
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Dan Brown (ddbhockey(AT)hotmail.com), Jan 30 2009
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EXTENSIONS
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Edited and extended by Zak Seidov and N. J. A. Sloane (njas(AT)research.att.com), Feb 10 2009
Sequence corrected by N. J. A. Sloane Aug 31 2009 using terms from the b-file.
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