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Search: id:A073055
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| A073055 |
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a(n) = product of first n digits in the decimal expansion of Pi, ignoring decimal point. |
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+0
2
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| 1, 3, 3, 12, 12, 60, 540, 1080, 6480, 32400, 97200, 486000, 3888000, 34992000, 244944000, 2204496000, 6613488000, 13226976000, 39680928000, 317447424000, 1269789696000, 7618738176000, 15237476352000, 91424858112000
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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33rd digit of Pi = 0, so a(33), a(34), .... = 0. - Philip Bergonio (percyweasley99(AT)yahoo.com), Feb 24 2003
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EXAMPLE
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Pi=3.141592653589793... so a(0)=1, a(1) = 3, a(2) = 3*1=3, a(3)=3*1*4=12, a(4)=3*1*4*1=12, and so on.
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MATHEMATICA
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FoldList[Times, 1, First[RealDigits[N[Pi, 50]]]] (Cunningham)
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CROSSREFS
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Cf. A000796.
Sequence in context: A065957 A032308 A117856 this_sequence A074850 A075780 A078666
Adjacent sequences: A073052 A073053 A073054 this_sequence A073056 A073057 A073058
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KEYWORD
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easy,nonn,base
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AUTHOR
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Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002
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EXTENSIONS
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Corrected and extended by Gabriel Cunningham (gcasey(AT)mit.edu), Oct 25 2004
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