A366170 - cp's OEIS frontend

A366170 Lexicographically earliest sequence of distinct positive integers such that for n>1, Sum_{i=1..n, a(i)<=n} a(a(i)) is prime.

n	a(n)
1	1
2	2
3	4
4	8
5	6
6	12
7	5
8	7
9	10
10	18
11	13
12	11
13	14
14	16
15	17
16	24
17	20
18	22
19	21
20	15
21	19
22	26
23	3
24	23
25	9
26	30
27	28
28	32
29	31
30	29
31	40
32	42
33	34
34	36
35	37
36	44
37	35
38	27
39	41
40	50
41	46
42	39
43	33
44	56
45	47
46	52
47	68
48	49
49	43
50	54
51	53
52	51
53	60
54	58
55	57
56	45
57	66
58	55
59	61
60	74
61	64
62	63
63	84
64	72
65	67
66	78
67	65
68	59
69	70
70	90
71	73
72	80

[1, 2, 4, 8, 6, 12, 5, 7, 10, 18, 13, 11, 14, 16, 17, 24, 20, 22, 21, 15, 19, 26, 3, 23, 9, 30, 28, 32, 31, 29, 40, 42, 34, 36, 37, 44, 35, 27, 41, 50, 46, 39, 33, 56, 47, 52, 68, 49, 43, 54, 53, 51, 60, 58, 57, 45, 66, 55, 61, 74, 64, 63, 84, 72, 67, 78, 65, 59, 70, 90, 73, 80]

cp's OEIS Frontend

A366170 Lexicographically earliest sequence of distinct positive integers such that for n>1, Sum_{i=1..n, a(i)<=n} a(a(i)) is prime.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	8
5	6
6	12
7	5
8	7
9	10
10	18
11	13
12	11
13	14
14	16
15	17
16	24
17	20
18	22
19	21
20	15
21	19
22	26
23	3
24	23
25	9
26	30
27	28
28	32
29	31
30	29
31	40
32	42
33	34
34	36
35	37
36	44
37	35
38	27
39	41
40	50
41	46
42	39
43	33
44	56
45	47
46	52
47	68
48	49
49	43
50	54
51	53
52	51
53	60
54	58
55	57
56	45
57	66
58	55
59	61
60	74
61	64
62	63
63	84
64	72
65	67
66	78
67	65
68	59
69	70
70	90
71	73
72	80

n	a(n)
1	1
2	2
3	4
4	8
5	6
6	12
7	5
8	7
9	10
10	18
11	13
12	11
13	14
14	16
15	17
16	24
17	20
18	22
19	21
20	15
21	19
22	26
23	3
24	23
25	9
26	30
27	28
28	32
29	31
30	29
31	40
32	42
33	34
34	36
35	37
36	44
37	35
38	27
39	41
40	50
41	46
42	39
43	33
44	56
45	47
46	52
47	68
48	49
49	43
50	54
51	53
52	51
53	60
54	58
55	57
56	45
57	66
58	55
59	61
60	74
61	64
62	63
63	84
64	72
65	67
66	78
67	65
68	59
69	70
70	90
71	73
72	80

n	a(n)
1	1
2	2
3	4
4	8
5	6
6	12
7	5
8	7
9	10
10	18
11	13
12	11
13	14
14	16
15	17
16	24
17	20
18	22
19	21
20	15
21	19
22	26
23	3
24	23
25	9
26	30
27	28
28	32
29	31
30	29
31	40
32	42
33	34
34	36
35	37
36	44
37	35
38	27
39	41
40	50
41	46
42	39
43	33
44	56
45	47
46	52
47	68
48	49
49	43
50	54
51	53
52	51
53	60
54	58
55	57
56	45
57	66
58	55
59	61
60	74
61	64
62	63
63	84
64	72
65	67
66	78
67	65
68	59
69	70
70	90
71	73
72	80