A112730 - cp's OEIS frontend

A112730 Numbers k such that the equation sigma(x)-phi(x)=k has at least one solution.

n	a(n)
1	2
2	5
3	7
4	10
5	11
6	14
7	15
8	16
9	18
10	20
11	22
12	23
13	24
14	26
15	27
16	28
17	30
18	32
19	33
20	34
21	35
22	36
23	38
24	39
25	40
26	42
27	44
28	47
29	48
30	50
31	52
32	54
33	56
34	59
35	60
36	62
37	63
38	64
39	66
40	67
41	68
42	72
43	73
44	74
45	75
46	76
47	78
48	79
49	80
50	83
51	84
52	86
53	87
54	88
55	90
56	92
57	94
58	95
59	96
60	98
61	100
62	102
63	104
64	106
65	107
66	108
67	110
68	112

[2, 5, 7, 10, 11, 14, 15, 16, 18, 20, 22, 23, 24, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 47, 48, 50, 52, 54, 56, 59, 60, 62, 63, 64, 66, 67, 68, 72, 73, 74, 75, 76, 78, 79, 80, 83, 84, 86, 87, 88, 90, 92, 94, 95, 96, 98, 100, 102, 104, 106, 107, 108, 110, 112]

cp's OEIS Frontend

A112730 Numbers k such that the equation sigma(x)-phi(x)=k has at least one solution.

Table of values

List of values

n	a(n)
1	2
2	5
3	7
4	10
5	11
6	14
7	15
8	16
9	18
10	20
11	22
12	23
13	24
14	26
15	27
16	28
17	30
18	32
19	33
20	34
21	35
22	36
23	38
24	39
25	40
26	42
27	44
28	47
29	48
30	50
31	52
32	54
33	56
34	59
35	60
36	62
37	63
38	64
39	66
40	67
41	68
42	72
43	73
44	74
45	75
46	76
47	78
48	79
49	80
50	83
51	84
52	86
53	87
54	88
55	90
56	92
57	94
58	95
59	96
60	98
61	100
62	102
63	104
64	106
65	107
66	108
67	110
68	112

n	a(n)
1	2
2	5
3	7
4	10
5	11
6	14
7	15
8	16
9	18
10	20
11	22
12	23
13	24
14	26
15	27
16	28
17	30
18	32
19	33
20	34
21	35
22	36
23	38
24	39
25	40
26	42
27	44
28	47
29	48
30	50
31	52
32	54
33	56
34	59
35	60
36	62
37	63
38	64
39	66
40	67
41	68
42	72
43	73
44	74
45	75
46	76
47	78
48	79
49	80
50	83
51	84
52	86
53	87
54	88
55	90
56	92
57	94
58	95
59	96
60	98
61	100
62	102
63	104
64	106
65	107
66	108
67	110
68	112

n	a(n)
1	2
2	5
3	7
4	10
5	11
6	14
7	15
8	16
9	18
10	20
11	22
12	23
13	24
14	26
15	27
16	28
17	30
18	32
19	33
20	34
21	35
22	36
23	38
24	39
25	40
26	42
27	44
28	47
29	48
30	50
31	52
32	54
33	56
34	59
35	60
36	62
37	63
38	64
39	66
40	67
41	68
42	72
43	73
44	74
45	75
46	76
47	78
48	79
49	80
50	83
51	84
52	86
53	87
54	88
55	90
56	92
57	94
58	95
59	96
60	98
61	100
62	102
63	104
64	106
65	107
66	108
67	110
68	112