A261303 - cp's OEIS frontend

A261303 a(n+1) = abs(a(n) - gcd(a(n), 3n+2)), a(1) = 1.

n	a(n)
1	1
2	0
3	8
4	7
5	0
6	17
7	16
8	15
9	14
10	13
11	12
12	11
13	10
14	9
15	8
16	7
17	6
18	5
19	4
20	3
21	2
22	1
23	0
24	71
25	70
26	63
27	62
28	61
29	60
30	59
31	58
32	57
33	56
34	55
35	54
36	53
37	52
38	51
39	50
40	49
41	48
42	47
43	46
44	45
45	44
46	43
47	42
48	41
49	40
50	39
51	38
52	37
53	36
54	35
55	34
56	33
57	32
58	31
59	30
60	29
61	28
62	27
63	26
64	25
65	24
66	23
67	22
68	21
69	20
70	19
71	18
72	17
73	16
74	15
75	14
76	13
77	12
78	11
79	10
80	9

[1, 0, 8, 7, 0, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 71, 70, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9]

cp's OEIS Frontend

A261303 a(n+1) = abs(a(n) - gcd(a(n), 3n+2)), a(1) = 1.

Table of values

List of values

n	a(n)
1	1
2	0
3	8
4	7
5	0
6	17
7	16
8	15
9	14
10	13
11	12
12	11
13	10
14	9
15	8
16	7
17	6
18	5
19	4
20	3
21	2
22	1
23	0
24	71
25	70
26	63
27	62
28	61
29	60
30	59
31	58
32	57
33	56
34	55
35	54
36	53
37	52
38	51
39	50
40	49
41	48
42	47
43	46
44	45
45	44
46	43
47	42
48	41
49	40
50	39
51	38
52	37
53	36
54	35
55	34
56	33
57	32
58	31
59	30
60	29
61	28
62	27
63	26
64	25
65	24
66	23
67	22
68	21
69	20
70	19
71	18
72	17
73	16
74	15
75	14
76	13
77	12
78	11
79	10
80	9

n	a(n)
1	1
2	0
3	8
4	7
5	0
6	17
7	16
8	15
9	14
10	13
11	12
12	11
13	10
14	9
15	8
16	7
17	6
18	5
19	4
20	3
21	2
22	1
23	0
24	71
25	70
26	63
27	62
28	61
29	60
30	59
31	58
32	57
33	56
34	55
35	54
36	53
37	52
38	51
39	50
40	49
41	48
42	47
43	46
44	45
45	44
46	43
47	42
48	41
49	40
50	39
51	38
52	37
53	36
54	35
55	34
56	33
57	32
58	31
59	30
60	29
61	28
62	27
63	26
64	25
65	24
66	23
67	22
68	21
69	20
70	19
71	18
72	17
73	16
74	15
75	14
76	13
77	12
78	11
79	10
80	9

n	a(n)
1	1
2	0
3	8
4	7
5	0
6	17
7	16
8	15
9	14
10	13
11	12
12	11
13	10
14	9
15	8
16	7
17	6
18	5
19	4
20	3
21	2
22	1
23	0
24	71
25	70
26	63
27	62
28	61
29	60
30	59
31	58
32	57
33	56
34	55
35	54
36	53
37	52
38	51
39	50
40	49
41	48
42	47
43	46
44	45
45	44
46	43
47	42
48	41
49	40
50	39
51	38
52	37
53	36
54	35
55	34
56	33
57	32
58	31
59	30
60	29
61	28
62	27
63	26
64	25
65	24
66	23
67	22
68	21
69	20
70	19
71	18
72	17
73	16
74	15
75	14
76	13
77	12
78	11
79	10
80	9