A088948 - cp's OEIS frontend

A088948 Numbers k such that (A006530(k) + A020639(k))/2 is an integer; that is, arithmetic mean of least and largest prime factor is an integer.

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	9
8	11
9	13
10	15
11	16
12	17
13	19
14	21
15	23
16	25
17	27
18	29
19	31
20	32
21	33
22	35
23	37
24	39
25	41
26	43
27	45
28	47
29	49
30	51
31	53
32	55
33	57
34	59
35	61
36	63
37	64
38	65
39	67
40	69
41	71
42	73
43	75
44	77
45	79
46	81
47	83
48	85
49	87
50	89
51	91
52	93
53	95
54	97
55	99
56	101
57	103
58	105
59	107
60	109
61	111
62	113
63	115
64	117
65	119
66	121
67	123
68	125

[2, 3, 4, 5, 7, 8, 9, 11, 13, 15, 16, 17, 19, 21, 23, 25, 27, 29, 31, 32, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 64, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125]

cp's OEIS Frontend

A088948 Numbers k such that (A006530(k) + A020639(k))/2 is an integer; that is, arithmetic mean of least and largest prime factor is an integer.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	9
8	11
9	13
10	15
11	16
12	17
13	19
14	21
15	23
16	25
17	27
18	29
19	31
20	32
21	33
22	35
23	37
24	39
25	41
26	43
27	45
28	47
29	49
30	51
31	53
32	55
33	57
34	59
35	61
36	63
37	64
38	65
39	67
40	69
41	71
42	73
43	75
44	77
45	79
46	81
47	83
48	85
49	87
50	89
51	91
52	93
53	95
54	97
55	99
56	101
57	103
58	105
59	107
60	109
61	111
62	113
63	115
64	117
65	119
66	121
67	123
68	125

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	9
8	11
9	13
10	15
11	16
12	17
13	19
14	21
15	23
16	25
17	27
18	29
19	31
20	32
21	33
22	35
23	37
24	39
25	41
26	43
27	45
28	47
29	49
30	51
31	53
32	55
33	57
34	59
35	61
36	63
37	64
38	65
39	67
40	69
41	71
42	73
43	75
44	77
45	79
46	81
47	83
48	85
49	87
50	89
51	91
52	93
53	95
54	97
55	99
56	101
57	103
58	105
59	107
60	109
61	111
62	113
63	115
64	117
65	119
66	121
67	123
68	125

n	a(n)
1	2
2	3
3	4
4	5
5	7
6	8
7	9
8	11
9	13
10	15
11	16
12	17
13	19
14	21
15	23
16	25
17	27
18	29
19	31
20	32
21	33
22	35
23	37
24	39
25	41
26	43
27	45
28	47
29	49
30	51
31	53
32	55
33	57
34	59
35	61
36	63
37	64
38	65
39	67
40	69
41	71
42	73
43	75
44	77
45	79
46	81
47	83
48	85
49	87
50	89
51	91
52	93
53	95
54	97
55	99
56	101
57	103
58	105
59	107
60	109
61	111
62	113
63	115
64	117
65	119
66	121
67	123
68	125