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Search: id:A084921
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| A084921 |
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LeastCommonMultiple(prime(n)-1, prime(n)+1). |
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+0
6
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| 3, 4, 12, 24, 60, 84, 144, 180, 264, 420, 480, 684, 840, 924, 1104, 1404, 1740, 1860, 2244, 2520, 2664, 3120, 3444, 3960, 4704, 5100, 5304, 5724, 5940, 6384, 8064, 8580, 9384, 9660, 11100, 11400, 12324, 13284, 13944, 14964, 16020, 16380
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(n)=A084920(n)/2 for n>1; a(n)=A084922(n)*3 for n>2.
Sequence A084921 consists of terms of sequences A055523 and A055527 for prime n > 2. - Toni Lassila (tlassila(AT)cc.hut.fi), Feb 02 2004
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MATHEMATICA
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f[n_]:=LCM[n-1, n+1]; lst={}; Do[p=Prime[n]; AppendTo[lst, f[p]], {n, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 04 2009]
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CROSSREFS
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Cf. A000040, A006093, A008864.
Cf. A055523, A055527.
Sequence in context: A111357 A081621 A073713 this_sequence A070765 A000577 A111758
Adjacent sequences: A084918 A084919 A084920 this_sequence A084922 A084923 A084924
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 11 2003
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