A336164 - cp's OEIS frontend

A336164 a(1) = 1; if n>1, and gcd(a(n-1), n) > 1 then a(n) = a(n-1)/gcd(a(n-1), n), otherwise a(n) = a(n-1) + n - 1.

n	a(n)
1	1
2	2
3	4
4	1
5	5
6	10
7	16
8	2
9	10
10	1
11	11
12	22
13	34
14	17
15	31
16	46
17	62
18	31
19	49
20	68
21	88
22	4
23	26
24	13
25	37
26	62
27	88
28	22
29	50
30	5
31	35
32	66
33	2
34	1
35	35
36	70
37	106
38	53
39	91
40	130
41	170
42	85
43	127
44	170
45	34
46	17
47	63
48	21
49	3
50	52
51	102
52	51
53	103
54	156
55	210
56	15
57	5
58	62
59	120
60	2
61	62
62	1
63	63
64	126
65	190
66	95
67	161
68	228
69	76

[1, 2, 4, 1, 5, 10, 16, 2, 10, 1, 11, 22, 34, 17, 31, 46, 62, 31, 49, 68, 88, 4, 26, 13, 37, 62, 88, 22, 50, 5, 35, 66, 2, 1, 35, 70, 106, 53, 91, 130, 170, 85, 127, 170, 34, 17, 63, 21, 3, 52, 102, 51, 103, 156, 210, 15, 5, 62, 120, 2, 62, 1, 63, 126, 190, 95, 161, 228, 76]

cp's OEIS Frontend

A336164 a(1) = 1; if n>1, and gcd(a(n-1), n) > 1 then a(n) = a(n-1)/gcd(a(n-1), n), otherwise a(n) = a(n-1) + n - 1.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	1
5	5
6	10
7	16
8	2
9	10
10	1
11	11
12	22
13	34
14	17
15	31
16	46
17	62
18	31
19	49
20	68
21	88
22	4
23	26
24	13
25	37
26	62
27	88
28	22
29	50
30	5
31	35
32	66
33	2
34	1
35	35
36	70
37	106
38	53
39	91
40	130
41	170
42	85
43	127
44	170
45	34
46	17
47	63
48	21
49	3
50	52
51	102
52	51
53	103
54	156
55	210
56	15
57	5
58	62
59	120
60	2
61	62
62	1
63	63
64	126
65	190
66	95
67	161
68	228
69	76

n	a(n)
1	1
2	2
3	4
4	1
5	5
6	10
7	16
8	2
9	10
10	1
11	11
12	22
13	34
14	17
15	31
16	46
17	62
18	31
19	49
20	68
21	88
22	4
23	26
24	13
25	37
26	62
27	88
28	22
29	50
30	5
31	35
32	66
33	2
34	1
35	35
36	70
37	106
38	53
39	91
40	130
41	170
42	85
43	127
44	170
45	34
46	17
47	63
48	21
49	3
50	52
51	102
52	51
53	103
54	156
55	210
56	15
57	5
58	62
59	120
60	2
61	62
62	1
63	63
64	126
65	190
66	95
67	161
68	228
69	76

n	a(n)
1	1
2	2
3	4
4	1
5	5
6	10
7	16
8	2
9	10
10	1
11	11
12	22
13	34
14	17
15	31
16	46
17	62
18	31
19	49
20	68
21	88
22	4
23	26
24	13
25	37
26	62
27	88
28	22
29	50
30	5
31	35
32	66
33	2
34	1
35	35
36	70
37	106
38	53
39	91
40	130
41	170
42	85
43	127
44	170
45	34
46	17
47	63
48	21
49	3
50	52
51	102
52	51
53	103
54	156
55	210
56	15
57	5
58	62
59	120
60	2
61	62
62	1
63	63
64	126
65	190
66	95
67	161
68	228
69	76