A261305 - cp's OEIS frontend

A261305 a(n+1) = abs(a(n) - gcd(a(n), 5*n+4)), u(1) = 1.

n	a(n)
1	1
2	0
3	14
4	13
5	12
6	11
7	10
8	9
9	8
10	7
11	6
12	5
13	4
14	3
15	2
16	1
17	0
18	89
19	88
20	77
21	76
22	75
23	72
24	71
25	70
26	69
27	68
28	67
29	66
30	65
31	64
32	63
33	62
34	61
35	60
36	59
37	58
38	57
39	56
40	55
41	54
42	53
43	52
44	51
45	50
46	49
47	48
48	47
49	46
50	45
51	44
52	43
53	42
54	41
55	40
56	39
57	38
58	37
59	36
60	35
61	34
62	33
63	32
64	31
65	30
66	29
67	28
68	27
69	26
70	25
71	24
72	23
73	22
74	21
75	20
76	19
77	18
78	17
79	16
80	15
81	14

[1, 0, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 89, 88, 77, 76, 75, 72, 71, 70, 69, 68, 67, 66, 65, 64, 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]

cp's OEIS Frontend

A261305 a(n+1) = abs(a(n) - gcd(a(n), 5*n+4)), u(1) = 1.

Table of values

List of values

n	a(n)
1	1
2	0
3	14
4	13
5	12
6	11
7	10
8	9
9	8
10	7
11	6
12	5
13	4
14	3
15	2
16	1
17	0
18	89
19	88
20	77
21	76
22	75
23	72
24	71
25	70
26	69
27	68
28	67
29	66
30	65
31	64
32	63
33	62
34	61
35	60
36	59
37	58
38	57
39	56
40	55
41	54
42	53
43	52
44	51
45	50
46	49
47	48
48	47
49	46
50	45
51	44
52	43
53	42
54	41
55	40
56	39
57	38
58	37
59	36
60	35
61	34
62	33
63	32
64	31
65	30
66	29
67	28
68	27
69	26
70	25
71	24
72	23
73	22
74	21
75	20
76	19
77	18
78	17
79	16
80	15
81	14

n	a(n)
1	1
2	0
3	14
4	13
5	12
6	11
7	10
8	9
9	8
10	7
11	6
12	5
13	4
14	3
15	2
16	1
17	0
18	89
19	88
20	77
21	76
22	75
23	72
24	71
25	70
26	69
27	68
28	67
29	66
30	65
31	64
32	63
33	62
34	61
35	60
36	59
37	58
38	57
39	56
40	55
41	54
42	53
43	52
44	51
45	50
46	49
47	48
48	47
49	46
50	45
51	44
52	43
53	42
54	41
55	40
56	39
57	38
58	37
59	36
60	35
61	34
62	33
63	32
64	31
65	30
66	29
67	28
68	27
69	26
70	25
71	24
72	23
73	22
74	21
75	20
76	19
77	18
78	17
79	16
80	15
81	14

n	a(n)
1	1
2	0
3	14
4	13
5	12
6	11
7	10
8	9
9	8
10	7
11	6
12	5
13	4
14	3
15	2
16	1
17	0
18	89
19	88
20	77
21	76
22	75
23	72
24	71
25	70
26	69
27	68
28	67
29	66
30	65
31	64
32	63
33	62
34	61
35	60
36	59
37	58
38	57
39	56
40	55
41	54
42	53
43	52
44	51
45	50
46	49
47	48
48	47
49	46
50	45
51	44
52	43
53	42
54	41
55	40
56	39
57	38
58	37
59	36
60	35
61	34
62	33
63	32
64	31
65	30
66	29
67	28
68	27
69	26
70	25
71	24
72	23
73	22
74	21
75	20
76	19
77	18
78	17
79	16
80	15
81	14