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Search: id:A113588
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| A113588 |
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a(1) = 3, a(n+1) = d!, where d is the first decimal digit sum of a(n). |
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+0
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| 3, 6, 720, 362880, 10888869450418352160768000000, 13246418194518289744998918371218325998102093606733580656865511524974618150915915\ 78895743130235002378688844343005686404521144382704205360039762937774080000000000\ 000000000000000
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(2) = 6, a(3) = 6! = 720, a(4)= (7+2+0)! = 9! = 362880. a(5) = 27!
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MAPLE
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A007953 := proc(n) add(i, i= convert(n, base, 10)) ; end: A113588 := proc(n) option remember ; if n = 1 then 3; else factorial(A007953(A113588(n-1)) ) ; fi; end: for n from 1 to 6 do printf("%d, ", A113588(n)) ; od: - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 06 2008
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CROSSREFS
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Sequence in context: A126297 A157540 A034879 this_sequence A071106 A157548 A134901
Adjacent sequences: A113585 A113586 A113587 this_sequence A113589 A113590 A113591
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 07 2005
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 06 2008
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