A107912 - cp's OEIS frontend

A107912 Numbers k that require two iterations of the sigma function to be >= 2*k.

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	10
8	11
9	14
10	15
11	16
12	17
13	19
14	21
15	22
16	23
17	26
18	27
19	29
20	31
21	32
22	33
23	34
24	35
25	38
26	39
27	41
28	44
29	45
30	46
31	47
32	50
33	51
34	52
35	53
36	55
37	57
38	58
39	59
40	62
41	63
42	64
43	65
44	68
45	69
46	71
47	74
48	75
49	76
50	77
51	79
52	82
53	83
54	85
55	86
56	87
57	89
58	91
59	92
60	93
61	94
62	95
63	98
64	99
65	101
66	103
67	105
68	106
69	107

[2, 3, 4, 5, 7, 8, 10, 11, 14, 15, 16, 17, 19, 21, 22, 23, 26, 27, 29, 31, 32, 33, 34, 35, 38, 39, 41, 44, 45, 46, 47, 50, 51, 52, 53, 55, 57, 58, 59, 62, 63, 64, 65, 68, 69, 71, 74, 75, 76, 77, 79, 82, 83, 85, 86, 87, 89, 91, 92, 93, 94, 95, 98, 99, 101, 103, 105, 106, 107]

cp's OEIS Frontend

A107912 Numbers k that require two iterations of the sigma function to be >= 2*k.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	10
8	11
9	14
10	15
11	16
12	17
13	19
14	21
15	22
16	23
17	26
18	27
19	29
20	31
21	32
22	33
23	34
24	35
25	38
26	39
27	41
28	44
29	45
30	46
31	47
32	50
33	51
34	52
35	53
36	55
37	57
38	58
39	59
40	62
41	63
42	64
43	65
44	68
45	69
46	71
47	74
48	75
49	76
50	77
51	79
52	82
53	83
54	85
55	86
56	87
57	89
58	91
59	92
60	93
61	94
62	95
63	98
64	99
65	101
66	103
67	105
68	106
69	107

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	10
8	11
9	14
10	15
11	16
12	17
13	19
14	21
15	22
16	23
17	26
18	27
19	29
20	31
21	32
22	33
23	34
24	35
25	38
26	39
27	41
28	44
29	45
30	46
31	47
32	50
33	51
34	52
35	53
36	55
37	57
38	58
39	59
40	62
41	63
42	64
43	65
44	68
45	69
46	71
47	74
48	75
49	76
50	77
51	79
52	82
53	83
54	85
55	86
56	87
57	89
58	91
59	92
60	93
61	94
62	95
63	98
64	99
65	101
66	103
67	105
68	106
69	107

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	10
8	11
9	14
10	15
11	16
12	17
13	19
14	21
15	22
16	23
17	26
18	27
19	29
20	31
21	32
22	33
23	34
24	35
25	38
26	39
27	41
28	44
29	45
30	46
31	47
32	50
33	51
34	52
35	53
36	55
37	57
38	58
39	59
40	62
41	63
42	64
43	65
44	68
45	69
46	71
47	74
48	75
49	76
50	77
51	79
52	82
53	83
54	85
55	86
56	87
57	89
58	91
59	92
60	93
61	94
62	95
63	98
64	99
65	101
66	103
67	105
68	106
69	107