A112819 Numbers k such that lcm(1,2,3,...,k)/15 equals the denominator of the k-th harmonic number H(k).

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, 41889597, 41889598, 41889599, 41889600, 41889601, 41889602, 41889603, 41889604, 41889605, 41889606, 41889607

Offset

1,1

Comments

When 15 occurs in A110566.

Links

Chai Wah Wu, Table of n, a(n) for n = 1..10000

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

Author

Robert G. Wilson v, Sep 17 2005

Extensions

Definition corrected by Jinyuan Wang, May 03 2020

More terms from Chai Wah Wu, Mar 18 2021

Status

approved