A112820 - OEIS

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A112820

Numbers k such that lcm(1,2,3,...,k)/17 equals the denominator of the k-th harmonic number H(k).

272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 79507, 79508, 79509, 79510, 79511, 79512, 79513, 79514, 79515, 79516, 79517, 79518, 79519, 79520, 79521, 79522, 79523, 79524, 79525, 79526, 79527, 79528

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

When 17 occurs in A110566.

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..10000 (n = 1..3106 from Jinyuan Wang)

MATHEMATICA

a = h = 1; t = {}; Do[a = LCM[a, n]; h = h + 1/n; If[a/Denominator[h] == 17, AppendTo[t, n]], {n, 79528}]; t

CROSSREFS

Cf. A002805, A003418, A110566.

Cf. A098464, A112813, A112814, A112815, A112816, A112817, A112818, A112819, A112821, A112822.