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Search: id:A136275
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| A136275 |
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Similar to A137284, but considering Sum{ k = 1,2,3,.. } 5^(-nk). |
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+0
1
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| 1, 2, 3, 5, 8, 12, 18, 26, 38, 55, 79, 114, 164, 235, 337, 483, 692, 991, 1418, 2029, 2903, 4154, 5944, 8504, 12167, 17408, 24906, 35633, 50980, 72936, 104348, 149289, 213585, 305572, 437175, 625457, 894827, 1280209, 1831566, 2620379, 3748915
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) = ceil( a(n-1)*log5(10) ) [From Max Alekseyev (maxale(AT)gmail.com), May 14 2009]
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EXAMPLE
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Start from 0.
0 + 5^(-1)= 0.2
0.2 + 5^(-2)= 0.24 (first digit "2" is equal to the decimal of previous number)
0.24 + 5^(-3)=0.248 (first digits "24" are equal to the decimals of previous number)
0.248 + 5^(-5)=0.24832 (first digits "248" are equal to the decimals of previous number)
etc.
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CROSSREFS
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Sequence in context: A098693 A122928 A001524 this_sequence A078408 A007478 A014605
Adjacent sequences: A136272 A136273 A136274 this_sequence A136276 A136277 A136278
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KEYWORD
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easy,nonn
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AUTHOR
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Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Mar 19 2008
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EXTENSIONS
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Extended by Max Alekseyev (maxale(AT)gmail.com), May 14 2009
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