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A118455
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a(1)=1, a(n) = product{k=2..n}P(k), where P(k) is the largest prime <= k.
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5
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1, 2, 6, 18, 90, 450, 3150, 22050, 154350, 1080450, 11884950, 130734450, 1699547850, 22094122050, 287223586650, 3733906626450, 63476412649650, 1079099015044050, 20502881285836950, 389554744430902050
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| a(6)=450 because the largest primes that do not exceed 2,3,4,5 and 6 are, respectively 2,3,3,5 and 5, having product 2*3*3*5*5=450.
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MAPLE
| a:=proc(n) if n=1 then 1 else product(prevprime(k+1), k=2..n) fi end: seq(a(n), n=1..23); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 30 2006
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CROSSREFS
| Cf. A118456, A002110, A034386.
Sequence in context: A141580 A007869 A144557 * A165774 A053505 A000138
Adjacent sequences: A118452 A118453 A118454 * A118456 A118457 A118458
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KEYWORD
| easy,nonn
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AUTHOR
| Leroy Quet Apr 28 2006
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 30 2006
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