A066077 - cp's OEIS frontend

A066077 a(n) is the number of x such that sigma(x)-1 is 0 or one of the first n-1 primes.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	10
9	11
10	14
11	15
12	17
13	18
14	21
15	22
16	25
17	27
18	30
19	31
20	32
21	37
22	38
23	40
24	43
25	46
26	48
27	49
28	51
29	53
30	54
31	56
32	58
33	60
34	61
35	63
36	64
37	66
38	67
39	68
40	74
41	75
42	79
43	81
44	86
45	87
46	88
47	89
48	90
49	93
50	96
51	97
52	100
53	107
54	108
55	114
56	115
57	117
58	120
59	122
60	123
61	124
62	125
63	128
64	130
65	134
66	135

[1, 2, 3, 4, 5, 7, 8, 10, 11, 14, 15, 17, 18, 21, 22, 25, 27, 30, 31, 32, 37, 38, 40, 43, 46, 48, 49, 51, 53, 54, 56, 58, 60, 61, 63, 64, 66, 67, 68, 74, 75, 79, 81, 86, 87, 88, 89, 90, 93, 96, 97, 100, 107, 108, 114, 115, 117, 120, 122, 123, 124, 125, 128, 130, 134, 135]

cp's OEIS Frontend

A066077 a(n) is the number of x such that sigma(x)-1 is 0 or one of the first n-1 primes.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	10
9	11
10	14
11	15
12	17
13	18
14	21
15	22
16	25
17	27
18	30
19	31
20	32
21	37
22	38
23	40
24	43
25	46
26	48
27	49
28	51
29	53
30	54
31	56
32	58
33	60
34	61
35	63
36	64
37	66
38	67
39	68
40	74
41	75
42	79
43	81
44	86
45	87
46	88
47	89
48	90
49	93
50	96
51	97
52	100
53	107
54	108
55	114
56	115
57	117
58	120
59	122
60	123
61	124
62	125
63	128
64	130
65	134
66	135

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	10
9	11
10	14
11	15
12	17
13	18
14	21
15	22
16	25
17	27
18	30
19	31
20	32
21	37
22	38
23	40
24	43
25	46
26	48
27	49
28	51
29	53
30	54
31	56
32	58
33	60
34	61
35	63
36	64
37	66
38	67
39	68
40	74
41	75
42	79
43	81
44	86
45	87
46	88
47	89
48	90
49	93
50	96
51	97
52	100
53	107
54	108
55	114
56	115
57	117
58	120
59	122
60	123
61	124
62	125
63	128
64	130
65	134
66	135

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	10
9	11
10	14
11	15
12	17
13	18
14	21
15	22
16	25
17	27
18	30
19	31
20	32
21	37
22	38
23	40
24	43
25	46
26	48
27	49
28	51
29	53
30	54
31	56
32	58
33	60
34	61
35	63
36	64
37	66
38	67
39	68
40	74
41	75
42	79
43	81
44	86
45	87
46	88
47	89
48	90
49	93
50	96
51	97
52	100
53	107
54	108
55	114
56	115
57	117
58	120
59	122
60	123
61	124
62	125
63	128
64	130
65	134
66	135