A384493 - cp's OEIS frontend

A384493 Composite integers k such that sigma(k) | (k + 1)*tau(k) where tau is number of divisors of k.

n	a(n)
1	20
2	35
3	104
4	207
5	399
6	464
7	650
8	1519
9	1952
10	2015
11	2774
12	2915
13	2975
14	4454
15	11339
16	22847
17	32318
18	63503
19	97019
20	122499
21	130304
22	352835
23	522752
24	924482
25	1949375
26	7366463
27	8382464
28	9486399
29	15857855
30	30222023
31	39992975
32	49280399
33	63483104
34	65094623
35	69291935
36	95309054

[20, 35, 104, 207, 399, 464, 650, 1519, 1952, 2015, 2774, 2915, 2975, 4454, 11339, 22847, 32318, 63503, 97019, 122499, 130304, 352835, 522752, 924482, 1949375, 7366463, 8382464, 9486399, 15857855, 30222023, 39992975, 49280399, 63483104, 65094623, 69291935, 95309054]

cp's OEIS Frontend

A384493 Composite integers k such that sigma(k) | (k + 1)*tau(k) where tau is number of divisors of k.

Table of values

List of values