A127427 - cp's OEIS frontend

A127427 a(n) = v_3( (6n)! ) - v_3( (3n)! ), where v_3(N) is the 3-adic valuation A007949(N).

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	8
6	9
7	10
8	12
9	13
10	14
11	16
12	17
13	18
14	22
15	23
16	24
17	26
18	27
19	28
20	30
21	31
22	32
23	35
24	36
25	37
26	39
27	40
28	41
29	43
30	44
31	45
32	48
33	49
34	50
35	52
36	53
37	54
38	56
39	57
40	58
41	63
42	64
43	65
44	67
45	68
46	69
47	71
48	72
49	73
50	76
51	77
52	78
53	80
54	81
55	82
56	84
57	85
58	86
59	89
60	90
61	91
62	93
63	94
64	95
65	97
66	98
67	99
68	103
69	104
70	105
71	107

[0, 1, 3, 4, 5, 8, 9, 10, 12, 13, 14, 16, 17, 18, 22, 23, 24, 26, 27, 28, 30, 31, 32, 35, 36, 37, 39, 40, 41, 43, 44, 45, 48, 49, 50, 52, 53, 54, 56, 57, 58, 63, 64, 65, 67, 68, 69, 71, 72, 73, 76, 77, 78, 80, 81, 82, 84, 85, 86, 89, 90, 91, 93, 94, 95, 97, 98, 99, 103, 104, 105, 107]

cp's OEIS Frontend

A127427 a(n) = v_3( (6n)! ) - v_3( (3n)! ), where v_3(N) is the 3-adic valuation A007949(N).

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	8
6	9
7	10
8	12
9	13
10	14
11	16
12	17
13	18
14	22
15	23
16	24
17	26
18	27
19	28
20	30
21	31
22	32
23	35
24	36
25	37
26	39
27	40
28	41
29	43
30	44
31	45
32	48
33	49
34	50
35	52
36	53
37	54
38	56
39	57
40	58
41	63
42	64
43	65
44	67
45	68
46	69
47	71
48	72
49	73
50	76
51	77
52	78
53	80
54	81
55	82
56	84
57	85
58	86
59	89
60	90
61	91
62	93
63	94
64	95
65	97
66	98
67	99
68	103
69	104
70	105
71	107

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	8
6	9
7	10
8	12
9	13
10	14
11	16
12	17
13	18
14	22
15	23
16	24
17	26
18	27
19	28
20	30
21	31
22	32
23	35
24	36
25	37
26	39
27	40
28	41
29	43
30	44
31	45
32	48
33	49
34	50
35	52
36	53
37	54
38	56
39	57
40	58
41	63
42	64
43	65
44	67
45	68
46	69
47	71
48	72
49	73
50	76
51	77
52	78
53	80
54	81
55	82
56	84
57	85
58	86
59	89
60	90
61	91
62	93
63	94
64	95
65	97
66	98
67	99
68	103
69	104
70	105
71	107

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	8
6	9
7	10
8	12
9	13
10	14
11	16
12	17
13	18
14	22
15	23
16	24
17	26
18	27
19	28
20	30
21	31
22	32
23	35
24	36
25	37
26	39
27	40
28	41
29	43
30	44
31	45
32	48
33	49
34	50
35	52
36	53
37	54
38	56
39	57
40	58
41	63
42	64
43	65
44	67
45	68
46	69
47	71
48	72
49	73
50	76
51	77
52	78
53	80
54	81
55	82
56	84
57	85
58	86
59	89
60	90
61	91
62	93
63	94
64	95
65	97
66	98
67	99
68	103
69	104
70	105
71	107