A080278 - cp's OEIS frontend

A080278 a(n) = (3^(v_3(n) + 1) - 1)/2, where v_3(n) = highest power of 3 dividing n = A007949(n).

n	a(n)
1	1
2	1
3	4
4	1
5	1
6	4
7	1
8	1
9	13
10	1
11	1
12	4
13	1
14	1
15	4
16	1
17	1
18	13
19	1
20	1
21	4
22	1
23	1
24	4
25	1
26	1
27	40
28	1
29	1
30	4
31	1
32	1
33	4
34	1
35	1
36	13
37	1
38	1
39	4
40	1
41	1
42	4
43	1
44	1
45	13
46	1
47	1
48	4
49	1
50	1
51	4
52	1
53	1
54	40
55	1
56	1
57	4
58	1
59	1
60	4
61	1
62	1
63	13
64	1
65	1
66	4
67	1
68	1
69	4
70	1
71	1
72	13
73	1
74	1
75	4
76	1
77	1
78	4
79	1
80	1
81	121
82	1
83	1
84	4
85	1
86	1
87	4
88	1
89	1
90	13
91	1
92	1
93	4
94	1
95	1
96	4
97	1
98	1

[1, 1, 4, 1, 1, 4, 1, 1, 13, 1, 1, 4, 1, 1, 4, 1, 1, 13, 1, 1, 4, 1, 1, 4, 1, 1, 40, 1, 1, 4, 1, 1, 4, 1, 1, 13, 1, 1, 4, 1, 1, 4, 1, 1, 13, 1, 1, 4, 1, 1, 4, 1, 1, 40, 1, 1, 4, 1, 1, 4, 1, 1, 13, 1, 1, 4, 1, 1, 4, 1, 1, 13, 1, 1, 4, 1, 1, 4, 1, 1, 121, 1, 1, 4, 1, 1, 4, 1, 1, 13, 1, 1, 4, 1, 1, 4, 1, 1]

cp's OEIS Frontend

A080278 a(n) = (3^(v_3(n) + 1) - 1)/2, where v_3(n) = highest power of 3 dividing n = A007949(n).

Table of values

List of values

n	a(n)
1	1
2	1
3	4
4	1
5	1
6	4
7	1
8	1
9	13
10	1
11	1
12	4
13	1
14	1
15	4
16	1
17	1
18	13
19	1
20	1
21	4
22	1
23	1
24	4
25	1
26	1
27	40
28	1
29	1
30	4
31	1
32	1
33	4
34	1
35	1
36	13
37	1
38	1
39	4
40	1
41	1
42	4
43	1
44	1
45	13
46	1
47	1
48	4
49	1
50	1
51	4
52	1
53	1
54	40
55	1
56	1
57	4
58	1
59	1
60	4
61	1
62	1
63	13
64	1
65	1
66	4
67	1
68	1
69	4
70	1
71	1
72	13
73	1
74	1
75	4
76	1
77	1
78	4
79	1
80	1
81	121
82	1
83	1
84	4
85	1
86	1
87	4
88	1
89	1
90	13
91	1
92	1
93	4
94	1
95	1
96	4
97	1
98	1

n	a(n)
1	1
2	1
3	4
4	1
5	1
6	4
7	1
8	1
9	13
10	1
11	1
12	4
13	1
14	1
15	4
16	1
17	1
18	13
19	1
20	1
21	4
22	1
23	1
24	4
25	1
26	1
27	40
28	1
29	1
30	4
31	1
32	1
33	4
34	1
35	1
36	13
37	1
38	1
39	4
40	1
41	1
42	4
43	1
44	1
45	13
46	1
47	1
48	4
49	1
50	1
51	4
52	1
53	1
54	40
55	1
56	1
57	4
58	1
59	1
60	4
61	1
62	1
63	13
64	1
65	1
66	4
67	1
68	1
69	4
70	1
71	1
72	13
73	1
74	1
75	4
76	1
77	1
78	4
79	1
80	1
81	121
82	1
83	1
84	4
85	1
86	1
87	4
88	1
89	1
90	13
91	1
92	1
93	4
94	1
95	1
96	4
97	1
98	1

n	a(n)
1	1
2	1
3	4
4	1
5	1
6	4
7	1
8	1
9	13
10	1
11	1
12	4
13	1
14	1
15	4
16	1
17	1
18	13
19	1
20	1
21	4
22	1
23	1
24	4
25	1
26	1
27	40
28	1
29	1
30	4
31	1
32	1
33	4
34	1
35	1
36	13
37	1
38	1
39	4
40	1
41	1
42	4
43	1
44	1
45	13
46	1
47	1
48	4
49	1
50	1
51	4
52	1
53	1
54	40
55	1
56	1
57	4
58	1
59	1
60	4
61	1
62	1
63	13
64	1
65	1
66	4
67	1
68	1
69	4
70	1
71	1
72	13
73	1
74	1
75	4
76	1
77	1
78	4
79	1
80	1
81	121
82	1
83	1
84	4
85	1
86	1
87	4
88	1
89	1
90	13
91	1
92	1
93	4
94	1
95	1
96	4
97	1
98	1