A231693 - cp's OEIS frontend

A231693 Define a sequence of rationals by f(0)=0, thereafter f(n)=f(n-1)-1/n if that is >= 0, otherwise f(n)=f(n-1)+1/n; a(n) = denominator of f(n).

n	a(n)
0	1
1	1
2	2
3	6
4	12
5	60
6	20
7	140
8	280
9	2520
10	2520
11	27720
12	27720
13	360360
14	360360
15	360360
16	720720
17	12252240
18	4084080
19	77597520
20	77597520
21	11085360
22	11085360
23	254963280
24	84987760
25	424938800
26	424938800
27	11473347600
28	80313433200
29	2329089562800
30	2329089562800
31	72201776446800
32	144403552893600
33	144403552893600

[1, 1, 2, 6, 12, 60, 20, 140, 280, 2520, 2520, 27720, 27720, 360360, 360360, 360360, 720720, 12252240, 4084080, 77597520, 77597520, 11085360, 11085360, 254963280, 84987760, 424938800, 424938800, 11473347600, 80313433200, 2329089562800, 2329089562800, 72201776446800, 144403552893600, 144403552893600]

cp's OEIS Frontend

A231693 Define a sequence of rationals by f(0)=0, thereafter f(n)=f(n-1)-1/n if that is >= 0, otherwise f(n)=f(n-1)+1/n; a(n) = denominator of f(n).

Table of values

List of values