A071166 - cp's OEIS frontend

A071166 a(n) = n - A006530(A000203(n)), difference between n and largest prime factor of the sum of its divisors.

n	a(n)
2	-1
3	1
4	-3
5	2
6	3
7	5
8	3
9	-4
10	7
11	8
12	5
13	6
14	11
15	12
16	-15
17	14
18	5
19	14
20	13
21	19
22	19
23	20
24	19
25	-6
26	19
27	22
28	21
29	24
30	27
31	29
32	25
33	30
34	31
35	32
36	23
37	18
38	33
39	32
40	35
41	34
42	39
43	32
44	37
45	32
46	43
47	44
48	17
49	30
50	19
51	48
52	45
53	50
54	49
55	52
56	51
57	52
58	53
59	54
60	53
61	30
62	59
63	50
64	-63
65	58
66	63
67	50
68	61
69	66
70	67
71	68
72	59
73	36
74	55
75	44
76	69
77	74
78	71
79	74
80	49
81	70
82	75
83	76
84	77
85	82
86	75
87	82
88	83

[-1, 1, -3, 2, 3, 5, 3, -4, 7, 8, 5, 6, 11, 12, -15, 14, 5, 14, 13, 19, 19, 20, 19, -6, 19, 22, 21, 24, 27, 29, 25, 30, 31, 32, 23, 18, 33, 32, 35, 34, 39, 32, 37, 32, 43, 44, 17, 30, 19, 48, 45, 50, 49, 52, 51, 52, 53, 54, 53, 30, 59, 50, -63, 58, 63, 50, 61, 66, 67, 68, 59, 36, 55, 44, 69, 74, 71, 74, 49, 70, 75, 76, 77, 82, 75, 82, 83]

cp's OEIS Frontend

A071166 a(n) = n - A006530(A000203(n)), difference between n and largest prime factor of the sum of its divisors.

Table of values

List of values

n	a(n)
2	-1
3	1
4	-3
5	2
6	3
7	5
8	3
9	-4
10	7
11	8
12	5
13	6
14	11
15	12
16	-15
17	14
18	5
19	14
20	13
21	19
22	19
23	20
24	19
25	-6
26	19
27	22
28	21
29	24
30	27
31	29
32	25
33	30
34	31
35	32
36	23
37	18
38	33
39	32
40	35
41	34
42	39
43	32
44	37
45	32
46	43
47	44
48	17
49	30
50	19
51	48
52	45
53	50
54	49
55	52
56	51
57	52
58	53
59	54
60	53
61	30
62	59
63	50
64	-63
65	58
66	63
67	50
68	61
69	66
70	67
71	68
72	59
73	36
74	55
75	44
76	69
77	74
78	71
79	74
80	49
81	70
82	75
83	76
84	77
85	82
86	75
87	82
88	83

n	a(n)
2	-1
3	1
4	-3
5	2
6	3
7	5
8	3
9	-4
10	7
11	8
12	5
13	6
14	11
15	12
16	-15
17	14
18	5
19	14
20	13
21	19
22	19
23	20
24	19
25	-6
26	19
27	22
28	21
29	24
30	27
31	29
32	25
33	30
34	31
35	32
36	23
37	18
38	33
39	32
40	35
41	34
42	39
43	32
44	37
45	32
46	43
47	44
48	17
49	30
50	19
51	48
52	45
53	50
54	49
55	52
56	51
57	52
58	53
59	54
60	53
61	30
62	59
63	50
64	-63
65	58
66	63
67	50
68	61
69	66
70	67
71	68
72	59
73	36
74	55
75	44
76	69
77	74
78	71
79	74
80	49
81	70
82	75
83	76
84	77
85	82
86	75
87	82
88	83

n	a(n)
2	-1
3	1
4	-3
5	2
6	3
7	5
8	3
9	-4
10	7
11	8
12	5
13	6
14	11
15	12
16	-15
17	14
18	5
19	14
20	13
21	19
22	19
23	20
24	19
25	-6
26	19
27	22
28	21
29	24
30	27
31	29
32	25
33	30
34	31
35	32
36	23
37	18
38	33
39	32
40	35
41	34
42	39
43	32
44	37
45	32
46	43
47	44
48	17
49	30
50	19
51	48
52	45
53	50
54	49
55	52
56	51
57	52
58	53
59	54
60	53
61	30
62	59
63	50
64	-63
65	58
66	63
67	50
68	61
69	66
70	67
71	68
72	59
73	36
74	55
75	44
76	69
77	74
78	71
79	74
80	49
81	70
82	75
83	76
84	77
85	82
86	75
87	82
88	83