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A051548
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a(n) = LCM { tau(1), ..., tau(n) }, a(0) = 1.
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2
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1, 1, 2, 2, 6, 6, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 60, 60, 60, 60, 60, 60, 60, 60, 120, 120, 120, 120, 120, 120, 120, 120, 120, 120, 120, 120, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360, 360
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OFFSET
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0,3
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COMMENTS
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a(0) = 1 as an empty product.
Records (new values) occur at positions: 0, 2, 4, 6, 24, 36, 64, 120, 840, 900, 1024, 1296, 4096, 7560, ...
(End)
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LINKS
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MATHEMATICA
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Block[{nn = 60, s}, s = DivisorSigma[0, Range@ nn]; {1}~Join~Table[LCM @@ s[[1 ;; n]], {n, nn}]] (* Michael De Vlieger, Aug 23 2017 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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a(0) = 1 prepended and the offset of the rest of terms corrected by Antti Karttunen, Aug 23 2017
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STATUS
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approved
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