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Search: id:A091835
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| A091835 |
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Double factorial of primes. |
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+0
1
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| 2, 3, 15, 105, 10395, 135135, 34459425, 654729075, 316234143225, 6190283353629375, 191898783962510625, 8200794532637891559375, 13113070457687988603440625, 563862029680583509947946875
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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a(n) = prime(n)!!
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EXAMPLE
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a(2) = 3 because 3*1=3.
a(3) = 15 because 5*3*1=15
......
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MATHEMATICA
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Table[ Prime[n]!!, {n, 14}]
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CROSSREFS
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Cf. A001147, A006882.
Sequence in context: A047014 A027519 A107413 this_sequence A131612 A087975 A097655
Adjacent sequences: A091832 A091833 A091834 this_sequence A091836 A091837 A091838
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KEYWORD
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nonn,easy
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AUTHOR
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Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Mar 09 2004
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 11 2004
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