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Search: id:A083554
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| A083554 |
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Least common multiple of p[n+1]-1 and p[n]-1. |
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+0
2
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| 2, 4, 12, 30, 60, 48, 144, 198, 308, 420, 180, 360, 840, 966, 1196, 1508, 1740, 660, 2310, 2520, 936, 3198, 3608, 1056, 2400, 5100, 5406, 5724, 3024, 1008, 8190, 8840, 9384, 10212, 11100, 3900, 4212, 13446, 14276, 15308, 16020, 3420, 18240, 9408
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OFFSET
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1,1
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FORMULA
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a(n)=LCM[A006093(n+1), A006093(n)]=LCM[p(n+1)-1, p(n)-1].
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EXAMPLE
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n=25: a(25)=LCM(97-1),(101-1)]=LCM[96,100]=2400
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MATHEMATICA
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f[x_] := Prime[x]-1 Table[LCM[f[w+1], f[w]], {w, 1, 128}]
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CROSSREFS
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Cf. A006093, A083538-A083555, A058263.
Sequence in context: A080876 A130135 A048618 this_sequence A059412 A079472 A006948
Adjacent sequences: A083551 A083552 A083553 this_sequence A083555 A083556 A083557
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), May 22 2003
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