A097883 - cp's OEIS frontend

A097883 Triangle read by rows where T(0,0) is 1, T(m,n) = smallest as-yet-unused (reading rows from left to right) positive integer which is coprime to both T(m-1,n) and T(m-1,n-1) (or is coprime to T(m-1,0) if n=0, or to T(m-1,m-1) if n=m).

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

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

cp's OEIS Frontend

A097883 Triangle read by rows where T(0,0) is 1, T(m,n) = smallest as-yet-unused (reading rows from left to right) positive integer which is coprime to both T(m-1,n) and T(m-1,n-1) (or is coprime to T(m-1,0) if n=0, or to T(m-1,m-1) if n=m).

Table of values

List of values

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

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

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