A381466 - cp's OEIS frontend

A381466 a(0) = 4; for n > 0, a(n) = a(n-1) + n if G = 1 or a(n) = n/G if G > 1, where G = gcd(a(n-1), n).

n	a(n)
0	4
1	5
2	7
3	10
4	2
5	7
6	13
7	20
8	2
9	11
10	21
11	32
12	3
13	16
14	7
15	22
16	8
17	25
18	43
19	62
20	10
21	31
22	53
23	76
24	6
25	31
26	57
27	9
28	37
29	66
30	5
31	36
32	8
33	41
34	75
35	7
36	43
37	80
38	19
39	58
40	20
41	61
42	103
43	146
44	22
45	67
46	113
47	160
48	3
49	52
50	25
51	76
52	13
53	66
54	9
55	64
56	7
57	64
58	29
59	88
60	15
61	76
62	31
63	94
64	32
65	97
66	163
67	230
68	34
69	103
70	173
71	244

[4, 5, 7, 10, 2, 7, 13, 20, 2, 11, 21, 32, 3, 16, 7, 22, 8, 25, 43, 62, 10, 31, 53, 76, 6, 31, 57, 9, 37, 66, 5, 36, 8, 41, 75, 7, 43, 80, 19, 58, 20, 61, 103, 146, 22, 67, 113, 160, 3, 52, 25, 76, 13, 66, 9, 64, 7, 64, 29, 88, 15, 76, 31, 94, 32, 97, 163, 230, 34, 103, 173, 244]

cp's OEIS Frontend

A381466 a(0) = 4; for n > 0, a(n) = a(n-1) + n if G = 1 or a(n) = n/G if G > 1, where G = gcd(a(n-1), n).

Table of values

List of values

n	a(n)
0	4
1	5
2	7
3	10
4	2
5	7
6	13
7	20
8	2
9	11
10	21
11	32
12	3
13	16
14	7
15	22
16	8
17	25
18	43
19	62
20	10
21	31
22	53
23	76
24	6
25	31
26	57
27	9
28	37
29	66
30	5
31	36
32	8
33	41
34	75
35	7
36	43
37	80
38	19
39	58
40	20
41	61
42	103
43	146
44	22
45	67
46	113
47	160
48	3
49	52
50	25
51	76
52	13
53	66
54	9
55	64
56	7
57	64
58	29
59	88
60	15
61	76
62	31
63	94
64	32
65	97
66	163
67	230
68	34
69	103
70	173
71	244

n	a(n)
0	4
1	5
2	7
3	10
4	2
5	7
6	13
7	20
8	2
9	11
10	21
11	32
12	3
13	16
14	7
15	22
16	8
17	25
18	43
19	62
20	10
21	31
22	53
23	76
24	6
25	31
26	57
27	9
28	37
29	66
30	5
31	36
32	8
33	41
34	75
35	7
36	43
37	80
38	19
39	58
40	20
41	61
42	103
43	146
44	22
45	67
46	113
47	160
48	3
49	52
50	25
51	76
52	13
53	66
54	9
55	64
56	7
57	64
58	29
59	88
60	15
61	76
62	31
63	94
64	32
65	97
66	163
67	230
68	34
69	103
70	173
71	244

n	a(n)
0	4
1	5
2	7
3	10
4	2
5	7
6	13
7	20
8	2
9	11
10	21
11	32
12	3
13	16
14	7
15	22
16	8
17	25
18	43
19	62
20	10
21	31
22	53
23	76
24	6
25	31
26	57
27	9
28	37
29	66
30	5
31	36
32	8
33	41
34	75
35	7
36	43
37	80
38	19
39	58
40	20
41	61
42	103
43	146
44	22
45	67
46	113
47	160
48	3
49	52
50	25
51	76
52	13
53	66
54	9
55	64
56	7
57	64
58	29
59	88
60	15
61	76
62	31
63	94
64	32
65	97
66	163
67	230
68	34
69	103
70	173
71	244