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Search: id:A112816
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| A112816 |
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Numbers n such that 9*LCM(1,2,3,...,n) equals the denominator of the n-th harmonic number H(n). |
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10
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| 63, 64, 65, 69, 70, 71, 189, 190, 191, 192, 193, 194, 195, 196, 197, 207, 208, 209, 210, 211, 212, 213, 214, 215, 1701, 1702, 1703, 1704, 1705, 1706, 1707, 1708, 1709, 1710, 1711, 1712, 1713, 1714, 1715, 1716, 1717, 1718, 1719, 1720, 1721, 1722, 1723, 1724
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OFFSET
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1,1
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COMMENT
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When 9 occurs in A110566.
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MATHEMATICA
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f[n_] := LCM @@ Range[n]/Denominator[ HarmonicNumber[n]]; Select[ Range[1724], f[ # ] == 9 &]
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CROSSREFS
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Cf. A002805, A003418, A110566.
Cf. A098464, A112813, A112814, A112815, A112817, A112818, A112819, A112820, A112821, A112822.
Sequence in context: A033383 A090635 A125638 this_sequence A045271 A095601 A095591
Adjacent sequences: A112813 A112814 A112815 this_sequence A112817 A112818 A112819
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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 17 2005
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