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Search: id:A127482
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| A127482 |
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Product of the nonzero digital products of all the prime numbers p(1) to p(n). |
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+0
1
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| 2, 6, 30, 210, 210, 630, 4410, 39690, 238140, 4286520, 12859560, 270050760, 1080203040, 12962436480, 362948221440, 5444223321600, 244990049472000, 1469940296832000, 61737492466944000, 432162447268608000
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OFFSET
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1,1
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FORMULA
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a(n)=product{1<=k<=n, dp_p(prime(k)} where prime(k)=A000040(k) and dp_p(m)=product of the non-zero digits of m in base p (p=10 for this sequence). - Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Sep 29 2007
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EXAMPLE
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a(7)=dp_10(2)*dp_10(3)*dp_10(5)*dp_10(7)*dp_10(11)*dp_10(13)*dp_10(17)=2*3*5*7*(1*1)*(1*3)*(1*7)=4410.
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CROSSREFS
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Cf. A007953, A007954, A131385, A131387, A131451.
Cf. A000040.
Adjacent sequences: A127479 A127480 A127481 this_sequence A127483 A127484 A127485
Sequence in context: A112385 A078700 A104561 this_sequence A118747 A129779 A068215
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KEYWORD
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base,easy,nonn
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AUTHOR
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Alain Van Kerckhoven (alain(AT)avk.org), Sep 12 2007
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EXTENSIONS
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Corrected and extended by Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Sep 29 2007
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