A297615 - cp's OEIS frontend

A297615 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 each triple of pairwise adjacent terms sums to a prime.

n	a(n)
1	1
2	2
3	4
4	6
5	5
6	8
7	3
8	20
9	16
10	7
11	10
12	18
13	23
14	14
15	22
16	12
17	9
18	26
19	24
20	35
21	32
22	11
23	38
24	36
25	17
26	30
27	42
28	15
29	28
30	34
31	29
32	44
33	66
34	31
35	40
36	46
37	48
38	21
39	76
40	58
41	47
42	54
43	78
44	45
45	60
46	13
47	70
48	82
49	33
50	88
51	56
52	41
53	74
54	62
55	27
56	50
57	68
58	59
59	52
60	72
61	19
62	136
63	64
64	43
65	92
66	80
67	84

[1, 2, 4, 6, 5, 8, 3, 20, 16, 7, 10, 18, 23, 14, 22, 12, 9, 26, 24, 35, 32, 11, 38, 36, 17, 30, 42, 15, 28, 34, 29, 44, 66, 31, 40, 46, 48, 21, 76, 58, 47, 54, 78, 45, 60, 13, 70, 82, 33, 88, 56, 41, 74, 62, 27, 50, 68, 59, 52, 72, 19, 136, 64, 43, 92, 80, 84]

cp's OEIS Frontend

A297615 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 each triple of pairwise adjacent terms sums to a prime.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	6
5	5
6	8
7	3
8	20
9	16
10	7
11	10
12	18
13	23
14	14
15	22
16	12
17	9
18	26
19	24
20	35
21	32
22	11
23	38
24	36
25	17
26	30
27	42
28	15
29	28
30	34
31	29
32	44
33	66
34	31
35	40
36	46
37	48
38	21
39	76
40	58
41	47
42	54
43	78
44	45
45	60
46	13
47	70
48	82
49	33
50	88
51	56
52	41
53	74
54	62
55	27
56	50
57	68
58	59
59	52
60	72
61	19
62	136
63	64
64	43
65	92
66	80
67	84

n	a(n)
1	1
2	2
3	4
4	6
5	5
6	8
7	3
8	20
9	16
10	7
11	10
12	18
13	23
14	14
15	22
16	12
17	9
18	26
19	24
20	35
21	32
22	11
23	38
24	36
25	17
26	30
27	42
28	15
29	28
30	34
31	29
32	44
33	66
34	31
35	40
36	46
37	48
38	21
39	76
40	58
41	47
42	54
43	78
44	45
45	60
46	13
47	70
48	82
49	33
50	88
51	56
52	41
53	74
54	62
55	27
56	50
57	68
58	59
59	52
60	72
61	19
62	136
63	64
64	43
65	92
66	80
67	84

n	a(n)
1	1
2	2
3	4
4	6
5	5
6	8
7	3
8	20
9	16
10	7
11	10
12	18
13	23
14	14
15	22
16	12
17	9
18	26
19	24
20	35
21	32
22	11
23	38
24	36
25	17
26	30
27	42
28	15
29	28
30	34
31	29
32	44
33	66
34	31
35	40
36	46
37	48
38	21
39	76
40	58
41	47
42	54
43	78
44	45
45	60
46	13
47	70
48	82
49	33
50	88
51	56
52	41
53	74
54	62
55	27
56	50
57	68
58	59
59	52
60	72
61	19
62	136
63	64
64	43
65	92
66	80
67	84