A358175 - cp's OEIS frontend

A358175 a(1) = 1, a(2) = 2; a(3) = 3; for n > 3, a(n) is the smallest positive number not occurring earlier that shares a factor with Sum_{k=1..n-1} A001065(a(k)), where A001065(m) is the sum of the proper divisors of m.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	8
8	19
9	10
10	7
11	29
12	9
13	12
14	14
15	15
16	18
17	16
18	20
19	127
20	22
21	24
22	26
23	28
24	21
25	233
26	13
27	25
28	241
29	11
30	27
31	30
32	32
33	35
34	33
35	17
36	34
37	36
38	433
39	31
40	39
41	38
42	40
43	42
44	44
45	45
46	48
47	727
48	46
49	50
50	797
51	49
52	52
53	51
54	54
55	57
56	37
57	60
58	56
59	55
60	58
61	62
62	63
63	1259
64	64
65	66
66	69
67	68
68	70
69	65
70	1579
71	72
72	78
73	77
74	74

[1, 2, 3, 4, 5, 6, 8, 19, 10, 7, 29, 9, 12, 14, 15, 18, 16, 20, 127, 22, 24, 26, 28, 21, 233, 13, 25, 241, 11, 27, 30, 32, 35, 33, 17, 34, 36, 433, 31, 39, 38, 40, 42, 44, 45, 48, 727, 46, 50, 797, 49, 52, 51, 54, 57, 37, 60, 56, 55, 58, 62, 63, 1259, 64, 66, 69, 68, 70, 65, 1579, 72, 78, 77, 74]

cp's OEIS Frontend

A358175 a(1) = 1, a(2) = 2; a(3) = 3; for n > 3, a(n) is the smallest positive number not occurring earlier that shares a factor with Sum_{k=1..n-1} A001065(a(k)), where A001065(m) is the sum of the proper divisors of m.

Table of values

List of values