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 A112819 Numbers k such that lcm(1,2,3,...,k)/15 equals the denominator of the k-th harmonic number H(k). 9
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS When 15 occurs in A110566. LINKS MATHEMATICA 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 CROSSREFS 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 KEYWORD nonn,more AUTHOR Robert G. Wilson v, Sep 17 2005 EXTENSIONS Definition corrected by Jinyuan Wang, May 03 2020 STATUS approved

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Last modified January 16 06:48 EST 2021. Contains 340204 sequences. (Running on oeis4.)