A334840 - cp's OEIS frontend

A334840 a(1) = 1, a(n) = a(n-1)/gcd(a(n-1),n) if this gcd is > 1, else a(n) = 4*a(n-1).

n	a(n)
1	1
2	4
3	16
4	4
5	16
6	8
7	32
8	4
9	16
10	8
11	32
12	8
13	32
14	16
15	64
16	4
17	16
18	8
19	32
20	8
21	32
22	16
23	64
24	8
25	32
26	16
27	64
28	16
29	64
30	32
31	128
32	4
33	16
34	8
35	32
36	8
37	32
38	16
39	64
40	8
41	32
42	16
43	64
44	16
45	64
46	32
47	128
48	8
49	32
50	16
51	64
52	16
53	64
54	32
55	128
56	16
57	64
58	32
59	128
60	32
61	128
62	64
63	256
64	4
65	16

[1, 4, 16, 4, 16, 8, 32, 4, 16, 8, 32, 8, 32, 16, 64, 4, 16, 8, 32, 8, 32, 16, 64, 8, 32, 16, 64, 16, 64, 32, 128, 4, 16, 8, 32, 8, 32, 16, 64, 8, 32, 16, 64, 16, 64, 32, 128, 8, 32, 16, 64, 16, 64, 32, 128, 16, 64, 32, 128, 32, 128, 64, 256, 4, 16]

cp's OEIS Frontend

A334840 a(1) = 1, a(n) = a(n-1)/gcd(a(n-1),n) if this gcd is > 1, else a(n) = 4*a(n-1).

Table of values

List of values

n	a(n)
1	1
2	4
3	16
4	4
5	16
6	8
7	32
8	4
9	16
10	8
11	32
12	8
13	32
14	16
15	64
16	4
17	16
18	8
19	32
20	8
21	32
22	16
23	64
24	8
25	32
26	16
27	64
28	16
29	64
30	32
31	128
32	4
33	16
34	8
35	32
36	8
37	32
38	16
39	64
40	8
41	32
42	16
43	64
44	16
45	64
46	32
47	128
48	8
49	32
50	16
51	64
52	16
53	64
54	32
55	128
56	16
57	64
58	32
59	128
60	32
61	128
62	64
63	256
64	4
65	16

n	a(n)
1	1
2	4
3	16
4	4
5	16
6	8
7	32
8	4
9	16
10	8
11	32
12	8
13	32
14	16
15	64
16	4
17	16
18	8
19	32
20	8
21	32
22	16
23	64
24	8
25	32
26	16
27	64
28	16
29	64
30	32
31	128
32	4
33	16
34	8
35	32
36	8
37	32
38	16
39	64
40	8
41	32
42	16
43	64
44	16
45	64
46	32
47	128
48	8
49	32
50	16
51	64
52	16
53	64
54	32
55	128
56	16
57	64
58	32
59	128
60	32
61	128
62	64
63	256
64	4
65	16

n	a(n)
1	1
2	4
3	16
4	4
5	16
6	8
7	32
8	4
9	16
10	8
11	32
12	8
13	32
14	16
15	64
16	4
17	16
18	8
19	32
20	8
21	32
22	16
23	64
24	8
25	32
26	16
27	64
28	16
29	64
30	32
31	128
32	4
33	16
34	8
35	32
36	8
37	32
38	16
39	64
40	8
41	32
42	16
43	64
44	16
45	64
46	32
47	128
48	8
49	32
50	16
51	64
52	16
53	64
54	32
55	128
56	16
57	64
58	32
59	128
60	32
61	128
62	64
63	256
64	4
65	16