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Search: id:A118455
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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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+0
6
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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; listen)
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OFFSET
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1,2
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EXAMPLE
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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
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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
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Cf. A118456, A002110, A034386.
Adjacent sequences: A118452 A118453 A118454 this_sequence A118456 A118457 A118458
Sequence in context: A113844 A007869 A118476 this_sequence A053505 A000138 A028857
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KEYWORD
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easy,nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Apr 28 2006
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 30 2006
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