A117385 - cp's OEIS frontend

A117385 Positive integers, each occurring twice in the sequence, such that a(n) = a(k) when n+k = 5*a(n), starting with a(1)=1 and filling the next vacant position with the smallest unused number.

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

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

cp's OEIS Frontend

A117385 Positive integers, each occurring twice in the sequence, such that a(n) = a(k) when n+k = 5*a(n), starting with a(1)=1 and filling the next vacant position with the smallest unused number.

Table of values

List of values

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

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

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