A325962 - cp's OEIS frontend

A325962 a(1) = 1; for n > 1, a(n) is the largest k <= 1+A046666(n) such that n-k and n-(sigma(n)-k) are relatively prime, or -1 if no such nonnegative k exists.

n	a(n)
1	1
2	1
3	0
4	3
5	0
6	5
7	0
8	7
9	7
10	9
11	0
12	11
13	0
14	13
15	10
16	15
17	0
18	17
19	0
20	19
21	18
22	21
23	0
24	23
25	21
26	25
27	24
28	27
29	0
30	29
31	0
32	31
33	28
34	33
35	30
36	35
37	0
38	37
39	36
40	39
41	0
42	41
43	0
44	43
45	40
46	45
47	0
48	47
49	43
50	49
51	44
52	51
53	0
54	53
55	50
56	55
57	54
58	57
59	0
60	59
61	0
62	61
63	60
64	63
65	60
66	65
67	0
68	67
69	64
70	69
71	0
72	71
73	0
74	73
75	72
76	75
77	70
78	77
79	0
80	79
81	79
82	81
83	0
84	83
85	80
86	85
87	82
88	87
89	0
90	89
91	82

[1, 1, 0, 3, 0, 5, 0, 7, 7, 9, 0, 11, 0, 13, 10, 15, 0, 17, 0, 19, 18, 21, 0, 23, 21, 25, 24, 27, 0, 29, 0, 31, 28, 33, 30, 35, 0, 37, 36, 39, 0, 41, 0, 43, 40, 45, 0, 47, 43, 49, 44, 51, 0, 53, 50, 55, 54, 57, 0, 59, 0, 61, 60, 63, 60, 65, 0, 67, 64, 69, 0, 71, 0, 73, 72, 75, 70, 77, 0, 79, 79, 81, 0, 83, 80, 85, 82, 87, 0, 89, 82]

cp's OEIS Frontend

A325962 a(1) = 1; for n > 1, a(n) is the largest k <= 1+A046666(n) such that n-k and n-(sigma(n)-k) are relatively prime, or -1 if no such nonnegative k exists.

Table of values

List of values

n	a(n)
1	1
2	1
3	0
4	3
5	0
6	5
7	0
8	7
9	7
10	9
11	0
12	11
13	0
14	13
15	10
16	15
17	0
18	17
19	0
20	19
21	18
22	21
23	0
24	23
25	21
26	25
27	24
28	27
29	0
30	29
31	0
32	31
33	28
34	33
35	30
36	35
37	0
38	37
39	36
40	39
41	0
42	41
43	0
44	43
45	40
46	45
47	0
48	47
49	43
50	49
51	44
52	51
53	0
54	53
55	50
56	55
57	54
58	57
59	0
60	59
61	0
62	61
63	60
64	63
65	60
66	65
67	0
68	67
69	64
70	69
71	0
72	71
73	0
74	73
75	72
76	75
77	70
78	77
79	0
80	79
81	79
82	81
83	0
84	83
85	80
86	85
87	82
88	87
89	0
90	89
91	82

n	a(n)
1	1
2	1
3	0
4	3
5	0
6	5
7	0
8	7
9	7
10	9
11	0
12	11
13	0
14	13
15	10
16	15
17	0
18	17
19	0
20	19
21	18
22	21
23	0
24	23
25	21
26	25
27	24
28	27
29	0
30	29
31	0
32	31
33	28
34	33
35	30
36	35
37	0
38	37
39	36
40	39
41	0
42	41
43	0
44	43
45	40
46	45
47	0
48	47
49	43
50	49
51	44
52	51
53	0
54	53
55	50
56	55
57	54
58	57
59	0
60	59
61	0
62	61
63	60
64	63
65	60
66	65
67	0
68	67
69	64
70	69
71	0
72	71
73	0
74	73
75	72
76	75
77	70
78	77
79	0
80	79
81	79
82	81
83	0
84	83
85	80
86	85
87	82
88	87
89	0
90	89
91	82

n	a(n)
1	1
2	1
3	0
4	3
5	0
6	5
7	0
8	7
9	7
10	9
11	0
12	11
13	0
14	13
15	10
16	15
17	0
18	17
19	0
20	19
21	18
22	21
23	0
24	23
25	21
26	25
27	24
28	27
29	0
30	29
31	0
32	31
33	28
34	33
35	30
36	35
37	0
38	37
39	36
40	39
41	0
42	41
43	0
44	43
45	40
46	45
47	0
48	47
49	43
50	49
51	44
52	51
53	0
54	53
55	50
56	55
57	54
58	57
59	0
60	59
61	0
62	61
63	60
64	63
65	60
66	65
67	0
68	67
69	64
70	69
71	0
72	71
73	0
74	73
75	72
76	75
77	70
78	77
79	0
80	79
81	79
82	81
83	0
84	83
85	80
86	85
87	82
88	87
89	0
90	89
91	82