A226476 - cp's OEIS frontend

A226476 Numbers n with the property that, if tau(n) = k = number of divisors of n, and the d(i) are the divisors [arranged in increasing order], then the sum 1/d(k) + 1/d(k-1) + 1/d(k-2) + ... + 1/d(q) is an integer for some q.

n	a(n)
1	1
2	6
3	24
4	28
5	120
6	496
7	672
8	2016
9	4320
10	4680
11	8128
12	8190
13	26208
14	30240
15	32760
16	42336
17	45864
18	392448
19	523776
20	714240
21	1571328
22	2178540
23	8910720
24	17428320
25	20427264
26	23569920
27	29795040
28	33550336
29	34369920
30	45532800
31	61900800

[1, 6, 24, 28, 120, 496, 672, 2016, 4320, 4680, 8128, 8190, 26208, 30240, 32760, 42336, 45864, 392448, 523776, 714240, 1571328, 2178540, 8910720, 17428320, 20427264, 23569920, 29795040, 33550336, 34369920, 45532800, 61900800]

cp's OEIS Frontend

A226476 Numbers n with the property that, if tau(n) = k = number of divisors of n, and the d(i) are the divisors [arranged in increasing order], then the sum 1/d(k) + 1/d(k-1) + 1/d(k-2) + ... + 1/d(q) is an integer for some q.

Table of values

List of values