A140661 - cp's OEIS frontend

A140661 Number of pairs (b,c) with the same prime factors, 1<=b<=c<=n.

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	8
8	11
9	13
10	14
11	15
12	17
13	18
14	19
15	20
16	24
17	25
18	28
19	29
20	31
21	32
22	33
23	34
24	38
25	40
26	41
27	44
28	46
29	47
30	48
31	49
32	54
33	55
34	56
35	57
36	62
37	63
38	64
39	65
40	68
41	69
42	70
43	71
44	73
45	75
46	76
47	77
48	83
49	85
50	89
51	90
52	92
53	93
54	100
55	101
56	104
57	105
58	106
59	107
60	109
61	110
62	111
63	113
64	119
65	120
66	121
67	122

[1, 2, 3, 5, 6, 7, 8, 11, 13, 14, 15, 17, 18, 19, 20, 24, 25, 28, 29, 31, 32, 33, 34, 38, 40, 41, 44, 46, 47, 48, 49, 54, 55, 56, 57, 62, 63, 64, 65, 68, 69, 70, 71, 73, 75, 76, 77, 83, 85, 89, 90, 92, 93, 100, 101, 104, 105, 106, 107, 109, 110, 111, 113, 119, 120, 121, 122]

cp's OEIS Frontend

A140661 Number of pairs (b,c) with the same prime factors, 1<=b<=c<=n.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	8
8	11
9	13
10	14
11	15
12	17
13	18
14	19
15	20
16	24
17	25
18	28
19	29
20	31
21	32
22	33
23	34
24	38
25	40
26	41
27	44
28	46
29	47
30	48
31	49
32	54
33	55
34	56
35	57
36	62
37	63
38	64
39	65
40	68
41	69
42	70
43	71
44	73
45	75
46	76
47	77
48	83
49	85
50	89
51	90
52	92
53	93
54	100
55	101
56	104
57	105
58	106
59	107
60	109
61	110
62	111
63	113
64	119
65	120
66	121
67	122

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	8
8	11
9	13
10	14
11	15
12	17
13	18
14	19
15	20
16	24
17	25
18	28
19	29
20	31
21	32
22	33
23	34
24	38
25	40
26	41
27	44
28	46
29	47
30	48
31	49
32	54
33	55
34	56
35	57
36	62
37	63
38	64
39	65
40	68
41	69
42	70
43	71
44	73
45	75
46	76
47	77
48	83
49	85
50	89
51	90
52	92
53	93
54	100
55	101
56	104
57	105
58	106
59	107
60	109
61	110
62	111
63	113
64	119
65	120
66	121
67	122

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	8
8	11
9	13
10	14
11	15
12	17
13	18
14	19
15	20
16	24
17	25
18	28
19	29
20	31
21	32
22	33
23	34
24	38
25	40
26	41
27	44
28	46
29	47
30	48
31	49
32	54
33	55
34	56
35	57
36	62
37	63
38	64
39	65
40	68
41	69
42	70
43	71
44	73
45	75
46	76
47	77
48	83
49	85
50	89
51	90
52	92
53	93
54	100
55	101
56	104
57	105
58	106
59	107
60	109
61	110
62	111
63	113
64	119
65	120
66	121
67	122