A382483 - cp's OEIS frontend

A382483 a(n) = smallest number k such that at least one of sigma(n) - k and sigma(n) + k is a perfect number.

n	a(n)
1	5
2	3
3	2
4	1
5	0
6	6
7	2
8	9
9	7
10	10
11	6
12	0
13	8
14	4
15	4
16	3
17	10
18	11
19	8
20	14
21	4
22	8
23	4
24	32
25	3
26	14
27	12
28	28
29	2
30	44
31	4
32	35
33	20
34	26
35	20
36	63
37	10
38	32
39	28
40	62
41	14
42	68
43	16
44	56
45	50
46	44
47	20
48	96
49	29
50	65
51	44
52	70
53	26
54	92
55	44
56	92
57	52
58	62
59	32
60	140
61	34
62	68
63	76
64	99
65	56
66	116
67	40
68	98
69	68
70	116
71	44
72	167
73	46
74	86
75	96
76	112
77	68
78	140

[5, 3, 2, 1, 0, 6, 2, 9, 7, 10, 6, 0, 8, 4, 4, 3, 10, 11, 8, 14, 4, 8, 4, 32, 3, 14, 12, 28, 2, 44, 4, 35, 20, 26, 20, 63, 10, 32, 28, 62, 14, 68, 16, 56, 50, 44, 20, 96, 29, 65, 44, 70, 26, 92, 44, 92, 52, 62, 32, 140, 34, 68, 76, 99, 56, 116, 40, 98, 68, 116, 44, 167, 46, 86, 96, 112, 68, 140]

cp's OEIS Frontend

A382483 a(n) = smallest number k such that at least one of sigma(n) - k and sigma(n) + k is a perfect number.

Table of values

List of values

n	a(n)
1	5
2	3
3	2
4	1
5	0
6	6
7	2
8	9
9	7
10	10
11	6
12	0
13	8
14	4
15	4
16	3
17	10
18	11
19	8
20	14
21	4
22	8
23	4
24	32
25	3
26	14
27	12
28	28
29	2
30	44
31	4
32	35
33	20
34	26
35	20
36	63
37	10
38	32
39	28
40	62
41	14
42	68
43	16
44	56
45	50
46	44
47	20
48	96
49	29
50	65
51	44
52	70
53	26
54	92
55	44
56	92
57	52
58	62
59	32
60	140
61	34
62	68
63	76
64	99
65	56
66	116
67	40
68	98
69	68
70	116
71	44
72	167
73	46
74	86
75	96
76	112
77	68
78	140

n	a(n)
1	5
2	3
3	2
4	1
5	0
6	6
7	2
8	9
9	7
10	10
11	6
12	0
13	8
14	4
15	4
16	3
17	10
18	11
19	8
20	14
21	4
22	8
23	4
24	32
25	3
26	14
27	12
28	28
29	2
30	44
31	4
32	35
33	20
34	26
35	20
36	63
37	10
38	32
39	28
40	62
41	14
42	68
43	16
44	56
45	50
46	44
47	20
48	96
49	29
50	65
51	44
52	70
53	26
54	92
55	44
56	92
57	52
58	62
59	32
60	140
61	34
62	68
63	76
64	99
65	56
66	116
67	40
68	98
69	68
70	116
71	44
72	167
73	46
74	86
75	96
76	112
77	68
78	140

n	a(n)
1	5
2	3
3	2
4	1
5	0
6	6
7	2
8	9
9	7
10	10
11	6
12	0
13	8
14	4
15	4
16	3
17	10
18	11
19	8
20	14
21	4
22	8
23	4
24	32
25	3
26	14
27	12
28	28
29	2
30	44
31	4
32	35
33	20
34	26
35	20
36	63
37	10
38	32
39	28
40	62
41	14
42	68
43	16
44	56
45	50
46	44
47	20
48	96
49	29
50	65
51	44
52	70
53	26
54	92
55	44
56	92
57	52
58	62
59	32
60	140
61	34
62	68
63	76
64	99
65	56
66	116
67	40
68	98
69	68
70	116
71	44
72	167
73	46
74	86
75	96
76	112
77	68
78	140