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A123279
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a(n) = product of the first n integers from among those positive integers which are coprime to n.
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0
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1, 3, 8, 105, 144, 85085, 5760, 2027025, 3203200, 4216455243, 43545600, 29248404810625, 6706022400, 1305433904506875, 1707444076642304, 191898783962510625, 376610217984000, 232876694951587194633125
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| The first 4 positive integers which are coprime to 4 are 1,3,5,7. So a(4) = 1*3*5*7 = 105.
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MATHEMATICA
| f[n_] := Block[{c = n, k = 0, p = 1}, While[c > 0, k++; While[GCD[k, n] > 1, k++ ]; c--; p *= k; ]; p]; Table[f[n], {n, 20}] (*Chandler*)
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CROSSREFS
| Cf. A069213, A077581, A077582.
Sequence in context: A099296 A066619 A028504 * A134803 A030063 A195568
Adjacent sequences: A123276 A123277 A123278 * A123280 A123281 A123282
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Dec 11 2006
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EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 14 2006
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