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Search: id:A112822
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| A112822 |
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Least number k such that LCM{1,2,...,k}/denominator of harmonic number H(k) = 2n-1. |
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11
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OFFSET
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1,2
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COMMENT
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First occurrence of 2n-1 in A110566. Tested to k>4190175
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MATHEMATICA
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a = h = 1; t = Table[0, {100}]; Do[a = LCM[a, n]; h = h + 1/n; b = a/Denominator[h]; If[b < 101 && t[[(b + 1)/2]] == 0, t[[(b + 1)/2]] = n], {n, 500000}]; t
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CROSSREFS
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Cf. A110566, A098464, A112813, A112814, A112815, A112816, A112817, A112818, A112819, A112820, A112821.
Sequence in context: A006676 A006768 A055969 this_sequence A033589 A077289 A110342
Adjacent sequences: A112819 A112820 A112821 this_sequence A112823 A112824 A112825
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 15 2005
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EXTENSIONS
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Sequence continues: a(10)=?,11881,100,66,822,28861,77,a(18)=?,1332,162,2758521,24649,21,a(24)=?,294,a(26)=?,1166,110,126059,201957,3660
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