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A051844
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Least common multiple of {2^k + 1, k=1..n}.
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2
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2, 6, 30, 90, 1530, 16830, 218790, 9407970, 2417848290, 137817352530, 28252557268650, 19296496614487950, 4650455684091595950, 12700394473254148539450, 41619192688853844763777650
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| lcm(2, 3, 5, ..., 2^n + 1)
Product_{k=1..n} cyclotomic(2*k-2, 2). - Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 05 2004
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EXAMPLE
| a(3) = lcm(2, 3, 5) = 30
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CROSSREFS
| Cf. A034268.
Cf. A019320.
Sequence in context: A117849 A088857 A099081 * A034501 A203461 A071758
Adjacent sequences: A051841 A051842 A051843 * A051845 A051846 A051847
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KEYWORD
| nonn
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AUTHOR
| Jeffrey Shallit (shallit(AT)graceland.uwaterloo.ca), Apr 20 2000
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