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Search: id:A062330
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| A062330 |
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a(n) = product of the sum and product of the digits of a(n-1) (0 is not to be considered a factor in the product). |
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+0
1
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| 2, 4, 16, 42, 48, 384, 1440, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 144
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,100
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EXAMPLE
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a(4) = 42 hence a(5) = 8*6 = 48.
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PROGRAM
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(PARI) SumD(x)= { s=0; while (x>9, s+=x-10*(x\10); x\=10); return(s + x) } ProdNzD(x)= { p=1; while (x>9, d=x-10*(x\10); if (d, p*=d); x\=10); return(p*x) } { for (n=1, 100, if (n>1, a=SumD(a)*ProdNzD(a), a=2); write("b062330.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 05 2009]
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CROSSREFS
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Sequence in context: A110998 A051861 A048222 this_sequence A133465 A110128 A148279
Adjacent sequences: A062327 A062328 A062329 this_sequence A062331 A062332 A062333
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KEYWORD
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nonn,base,easy
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 21 2001
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EXTENSIONS
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Corrected and extended by Larry Reeves (larryr(AT)acm.org) and Harvey P. Dale (hpd1(AT)nyu.edu), Jun 22 2001
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