A386925 - cp's OEIS frontend

A386925 a(n) = numerator(Sum_{k=1..n} d(k+1)/d(k)), where d is the number of divisors function.

n	a(n)
1	2
2	3
3	9
4	31
5	43
6	23
7	29
8	125
9	47
10	49
11	61
12	187
13	211
14	223
15	119
16	607
17	697
18	707
19	797
20	817
21	847
22	431
23	491
24	3973
25	4133
26	4253
27	4433
28	1491
29	1651
30	1661
31	1781
32	5423
33	5543
34	5663
35	5933
36	17879
37	18599
38	18959
39	19679
40	19769
41	21209
42	21299
43	22379
44	22739
45	22979
46	23159
47	24959
48	25067

[2, 3, 9, 31, 43, 23, 29, 125, 47, 49, 61, 187, 211, 223, 119, 607, 697, 707, 797, 817, 847, 431, 491, 3973, 4133, 4253, 4433, 1491, 1651, 1661, 1781, 5423, 5543, 5663, 5933, 17879, 18599, 18959, 19679, 19769, 21209, 21299, 22379, 22739, 22979, 23159, 24959, 25067]

cp's OEIS Frontend

A386925 a(n) = numerator(Sum_{k=1..n} d(k+1)/d(k)), where d is the number of divisors function.

Table of values

List of values