A084408 - cp's OEIS frontend

A084408 Triangle read by rows: if n is prime, row n contains the n smallest primes not already used; if n is composite, row n contains the n smallest composite numbers not already used. A permutation of the positive integers.

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	11
7	4
8	6
9	8
10	9
11	13
12	17
13	19
14	23
15	29
16	10
17	12
18	14
19	15
20	16
21	18
22	31
23	37
24	41
25	43
26	47
27	53
28	59
29	20
30	21
31	22
32	24
33	25
34	26
35	27
36	28
37	30
38	32
39	33
40	34
41	35
42	36
43	38
44	39
45	40
46	42
47	44
48	45
49	46
50	48
51	49
52	50
53	51
54	52
55	54
56	61
57	67
58	71
59	73
60	79
61	83
62	89
63	97
64	101
65	103
66	107
67	55
68	56
69	57
70	58
71	60

[1, 2, 3, 5, 7, 11, 4, 6, 8, 9, 13, 17, 19, 23, 29, 10, 12, 14, 15, 16, 18, 31, 37, 41, 43, 47, 53, 59, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 55, 56, 57, 58, 60]

cp's OEIS Frontend

A084408 Triangle read by rows: if n is prime, row n contains the n smallest primes not already used; if n is composite, row n contains the n smallest composite numbers not already used. A permutation of the positive integers.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	11
7	4
8	6
9	8
10	9
11	13
12	17
13	19
14	23
15	29
16	10
17	12
18	14
19	15
20	16
21	18
22	31
23	37
24	41
25	43
26	47
27	53
28	59
29	20
30	21
31	22
32	24
33	25
34	26
35	27
36	28
37	30
38	32
39	33
40	34
41	35
42	36
43	38
44	39
45	40
46	42
47	44
48	45
49	46
50	48
51	49
52	50
53	51
54	52
55	54
56	61
57	67
58	71
59	73
60	79
61	83
62	89
63	97
64	101
65	103
66	107
67	55
68	56
69	57
70	58
71	60

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	11
7	4
8	6
9	8
10	9
11	13
12	17
13	19
14	23
15	29
16	10
17	12
18	14
19	15
20	16
21	18
22	31
23	37
24	41
25	43
26	47
27	53
28	59
29	20
30	21
31	22
32	24
33	25
34	26
35	27
36	28
37	30
38	32
39	33
40	34
41	35
42	36
43	38
44	39
45	40
46	42
47	44
48	45
49	46
50	48
51	49
52	50
53	51
54	52
55	54
56	61
57	67
58	71
59	73
60	79
61	83
62	89
63	97
64	101
65	103
66	107
67	55
68	56
69	57
70	58
71	60

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	11
7	4
8	6
9	8
10	9
11	13
12	17
13	19
14	23
15	29
16	10
17	12
18	14
19	15
20	16
21	18
22	31
23	37
24	41
25	43
26	47
27	53
28	59
29	20
30	21
31	22
32	24
33	25
34	26
35	27
36	28
37	30
38	32
39	33
40	34
41	35
42	36
43	38
44	39
45	40
46	42
47	44
48	45
49	46
50	48
51	49
52	50
53	51
54	52
55	54
56	61
57	67
58	71
59	73
60	79
61	83
62	89
63	97
64	101
65	103
66	107
67	55
68	56
69	57
70	58
71	60