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Search: id:A062919
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| A062919 |
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"Reverse factorials": product of the digit reversals of the numbers 1 through n. |
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+0
2
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| 1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 362880, 3991680, 83825280, 2598583680, 106541930880, 5433638474880, 331451946967680, 23533088234705280, 1906180147011127680, 173462393378012618880
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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How many trailing zeros are there in a(n)?
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,100
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EXAMPLE
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a(11) =3991680 = 1*2*3*4*5*6*7*8*9*R(10)*R(11) = 1*2*3*4*5*6*7*8*9*1*11.
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PROGRAM
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(PARI) Rev(x)= { local(d); r=0; while (x>0, d=x-10*(x\10); x\=10; r=r*10 + d); return(r) } { for (n=0, 100, if (n, a*=Rev(n), a=1); write("b062919.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 13 2009]
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CROSSREFS
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Sequence in context: A109834 A131451 A084012 this_sequence A154657 A152693 A152712
Adjacent sequences: A062916 A062917 A062918 this_sequence A062920 A062921 A062922
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KEYWORD
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base,nonn,easy
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 02 2001
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EXTENSIONS
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More terms from Lior Manor (lior.manor(AT)gmail.com) and Larry Reeves (larryr(AT)acm.org), Jul 05 2001
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