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Search: id:A130820
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| A130820 |
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Decimal expansion of number whose Engel expansion is given by the sequence: 1,1,2,2,3,3,4,4,...Ceiling[n/2],... |
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+0
2
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| 2, 8, 7, 0, 2, 2, 2, 1, 5, 6, 9, 7, 3, 3, 9, 6, 3, 3, 0, 8, 1, 9, 4, 5, 8, 8, 6, 5, 8, 1, 1, 1, 9, 9, 6, 0, 1, 2, 4, 0, 3, 1, 9, 2, 6, 2, 2, 8, 0, 9, 9, 5, 7, 0, 1, 2, 0, 3, 1, 2, 7, 7, 3, 6, 2, 7, 2, 8, 5, 0, 3, 8, 0, 7, 6, 8, 0, 3, 7, 5, 2, 7, 8, 4, 5, 6, 3, 9, 2, 3, 6, 1, 5, 0, 7, 1, 4, 8, 2, 4
(list; cons; graph; listen)
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OFFSET
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1,1
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REFERENCES
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Engel, F. "Entwicklung der Zahlen nach Stammbruechen" Verhandlungen der 52. Versammlung deutscher Philologen und Schulmaenner in Marburg. pp. 190-191, 1913.
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LINKS
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Eric Weisstein's World of Mathematics, Engel Expansion.
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MATHEMATICA
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\!\(f[ n_ ] := \[ Product ]\+\(r = 1\)\%n Ceiling[ r/2 ]\) \!\(N[ \[ Sum ]\+\(n = 1\)\%1000 1\/f[ n ], 100 ]\)
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CROSSREFS
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Cf. A006784, A064648, A101689.
Adjacent sequences: A130817 A130818 A130819 this_sequence A130821 A130822 A130823
Sequence in context: A098221 A009214 A021781 this_sequence A134877 A085298 A011060
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KEYWORD
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cons,easy,nonn
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AUTHOR
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Stephen Casey (hexomino(AT)gmail.com), Jul 17 2007
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