A058072 - cp's OEIS frontend

A058072 Numbers k such that sigma(k) divides sigma(k+1), where sigma(k) is sum of positive divisors of k.

n	a(n)
1	1
2	5
3	14
4	125
5	206
6	957
7	1253
8	1334
9	1364
10	1634
11	1673
12	1919
13	2685
14	2759
15	2974
16	3127
17	4364
18	5191
19	7615
20	11219
21	12035
22	14841
23	18873
24	19358
25	20145
26	24957
27	27089
28	33998
29	36566
30	42818
31	43817
32	47795
33	48559
34	49955
35	50039
36	56564
37	56975
38	58373
39	58463

[1, 5, 14, 125, 206, 957, 1253, 1334, 1364, 1634, 1673, 1919, 2685, 2759, 2974, 3127, 4364, 5191, 7615, 11219, 12035, 14841, 18873, 19358, 20145, 24957, 27089, 33998, 36566, 42818, 43817, 47795, 48559, 49955, 50039, 56564, 56975, 58373, 58463]

cp's OEIS Frontend

A058072 Numbers k such that sigma(k) divides sigma(k+1), where sigma(k) is sum of positive divisors of k.

Table of values

List of values