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A112819
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Numbers k such that lcm(1,2,3,...,k)/15 equals the denominator of the k-th harmonic number H(k).
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9
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20, 24, 529, 530, 531, 532, 533, 534, 535, 536, 537, 538, 539, 540, 541, 542, 543, 544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556, 557, 558
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OFFSET
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1,1
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COMMENTS
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When 15 occurs in A110566.
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LINKS
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Table of n, a(n) for n=1..32.
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MATHEMATICA
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a = h = 1; t = {}; Do[a = LCM[a, n]; h = h + 1/n; If[a/Denominator[h] == 15, AppendTo[t, n]], {n, 10^6}]; t
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CROSSREFS
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Cf. A002805, A003418, A110566.
Cf. A098464, A112813, A112814, A112815, A112816, A112817, A112818, A112820, A112821, A112822.
Sequence in context: A219392 A193572 A167323 * A070684 A295152 A292199
Adjacent sequences: A112816 A112817 A112818 * A112820 A112821 A112822
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KEYWORD
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nonn,more
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AUTHOR
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Robert G. Wilson v, Sep 17 2005
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EXTENSIONS
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Definition corrected by Jinyuan Wang, May 03 2020
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STATUS
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approved
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