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Search: id:A118456
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| A118456 |
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a(n) = product{k=1..n} P(k), where P(k) is the smallest prime >= k. |
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+0
6
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| 2, 4, 12, 60, 300, 2100, 14700, 161700, 1778700, 19565700, 215222700, 2797895100, 36372636300, 618334817100, 10511691890700, 178698762141900, 3037878956412300, 57719700171833700, 1096674303264840300, 25223508975091326900, 580140706427100518700, 13343236247823311930100
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(5)=300 because the smallest primes that are not smaller than 1,2,3,4,and 5 are 2,2,3,5, and 5, respectively, having product 2*2*3*5*5=300.
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MAPLE
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a:=n->product(nextprime(k-1), k=1..n): seq(a(n), n=1..22); (Deutsch)
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CROSSREFS
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Cf. A118455, A002110, A034386.
Adjacent sequences: A118453 A118454 A118455 this_sequence A118457 A118458 A118459
Sequence in context: A058254 A076244 A058255 this_sequence A013202 A004400 A005831
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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) and Jonathan Vos Post (jvospost2(AT)yahoo.com), Apr 29 2006
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