A297673 - cp's OEIS frontend

A297673 Triangular array T(n, k) read by rows, n > 0, 0 < k <= n: T(n, k) = least unused positive value (reading rows from left to right) such that T(n, k) + T(n+1, k) + T(n+1, k+1) is prime.

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

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

cp's OEIS Frontend

A297673 Triangular array T(n, k) read by rows, n > 0, 0 < k <= n: T(n, k) = least unused positive value (reading rows from left to right) such that T(n, k) + T(n+1, k) + T(n+1, k+1) is prime.

Table of values

List of values

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

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

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