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Search: id:A111687
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| A111687 |
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Comprimorial(n): the product of the first n primes and the first n composite numbers. |
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+0
1
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| 8, 144, 5760, 362880, 39916800, 6227020800, 1482030950400, 422378820864000, 155435406077952000, 81137281972690944000, 50305114823068385280000, 39087074217524135362560000, 35256540944206770097029120000
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n) = A002110(n)*A036691(n) for n>=1. - Rick L. Shepherd (rshepherd2(AT)hotmail.com), Aug 20 2005
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EXAMPLE
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a(1) = 2*4 = 8, a(2) = (2*3)*(4*6)=144.
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CROSSREFS
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Cf. A002110 (primorials), A036691 (compositorials).
Sequence in context: A052764 A024284 A024285 this_sequence A071305 A105046 A123812
Adjacent sequences: A111684 A111685 A111686 this_sequence A111688 A111689 A111690
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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), Aug 17 2005
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EXTENSIONS
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Corrected and extended by Rick L. Shepherd (rshepherd2(AT)hotmail.com), Aug 20 2005
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