

A125901


Triangle of the denominators of the almostharmonic numbers: nth term in mth row is denominator of (sum{k=1 to m} 1/k)  1/n, 1<=n<=m.


1



1, 2, 1, 6, 3, 2, 12, 12, 4, 6, 60, 60, 20, 30, 12, 20, 20, 60, 5, 4, 60, 140, 140, 420, 35, 28, 420, 20, 280, 280, 840, 280, 56, 840, 40, 140, 2520, 2520, 2520, 2520, 504, 2520, 360, 1260, 280, 2520, 2520, 2520, 2520, 2520, 2520, 360, 1260, 280, 2520, 27720, 27720
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..57.


EXAMPLE

Triangle of almostharmonic numbers begins:
0
1/2,1
5/6,4/3,3/2
13/12,19/12,7/4,11/6
77/60,107/60,39/20,61/30,25/12


MATHEMATICA

t[m_, n_] := Sum[1/k, {k, m}]  1/n; Denominator @ Flatten @ Table[t[m, n], {m, 11}, {n, m}] (* Ray Chandler, Dec 14 2006 *)


CROSSREFS

Cf. A125900.
Sequence in context: A158442 A252095 A120435 * A094307 A097905 A094310
Adjacent sequences: A125898 A125899 A125900 * A125902 A125903 A125904


KEYWORD

frac,nonn,tabl


AUTHOR

Leroy Quet, Dec 13 2006


EXTENSIONS

Extended by Ray Chandler, Dec 14 2006


STATUS

approved



