A111936 - cp's OEIS frontend

A111936 Denominator of n-th term of the harmonic series after removal of all terms 1/m from Sum_{m=1..n} 1/m for which m contains a 9 in its decimal representation.

n	a(n)
1	1
2	2
3	6
4	12
5	60
6	20
7	140
8	280
9	280
10	3080
11	9240
12	120120
13	120120
14	40040
15	80080
16	1361360
17	12252240
18	2450448
19	2450448
20	2450448
21	56360304
22	56360304
23	1409007600
24	1409007600
25	4227022800
26	4227022800
27	4227022800
28	131037706800
29	262075413600

[1, 2, 6, 12, 60, 20, 140, 280, 280, 3080, 9240, 120120, 120120, 40040, 80080, 1361360, 12252240, 2450448, 2450448, 2450448, 56360304, 56360304, 1409007600, 1409007600, 4227022800, 4227022800, 4227022800, 131037706800, 262075413600]

cp's OEIS Frontend

A111936 Denominator of n-th term of the harmonic series after removal of all terms 1/m from Sum_{m=1..n} 1/m for which m contains a 9 in its decimal representation.

Table of values

List of values