A072618 - cp's OEIS frontend

A072618 Numbers n for which the prime circle problem has a simple solution: the arrangement of numbers 1 through 2n around a circle is such that the sum of each pair of adjacent numbers is prime and the odd and even numbers are in order in opposite directions.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	12
11	13
12	14
13	15
14	18
15	19
16	20
17	21
18	24
19	27
20	28
21	29
22	30
23	33
24	34
25	35
26	36
27	39
28	42
29	45
30	48
31	49
32	50
33	51
34	52
35	53
36	54
37	60
38	63
39	66
40	67
41	68
42	69
43	72
44	73
45	74
46	75
47	78
48	81
49	84
50	87
51	88
52	89
53	90
54	93
55	94
56	95
57	96
58	97
59	98
60	99
61	102
62	105
63	108
64	111
65	112
66	113
67	114
68	117
69	118

[1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 18, 19, 20, 21, 24, 27, 28, 29, 30, 33, 34, 35, 36, 39, 42, 45, 48, 49, 50, 51, 52, 53, 54, 60, 63, 66, 67, 68, 69, 72, 73, 74, 75, 78, 81, 84, 87, 88, 89, 90, 93, 94, 95, 96, 97, 98, 99, 102, 105, 108, 111, 112, 113, 114, 117, 118]

cp's OEIS Frontend

A072618 Numbers n for which the prime circle problem has a simple solution: the arrangement of numbers 1 through 2n around a circle is such that the sum of each pair of adjacent numbers is prime and the odd and even numbers are in order in opposite directions.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	12
11	13
12	14
13	15
14	18
15	19
16	20
17	21
18	24
19	27
20	28
21	29
22	30
23	33
24	34
25	35
26	36
27	39
28	42
29	45
30	48
31	49
32	50
33	51
34	52
35	53
36	54
37	60
38	63
39	66
40	67
41	68
42	69
43	72
44	73
45	74
46	75
47	78
48	81
49	84
50	87
51	88
52	89
53	90
54	93
55	94
56	95
57	96
58	97
59	98
60	99
61	102
62	105
63	108
64	111
65	112
66	113
67	114
68	117
69	118

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	12
11	13
12	14
13	15
14	18
15	19
16	20
17	21
18	24
19	27
20	28
21	29
22	30
23	33
24	34
25	35
26	36
27	39
28	42
29	45
30	48
31	49
32	50
33	51
34	52
35	53
36	54
37	60
38	63
39	66
40	67
41	68
42	69
43	72
44	73
45	74
46	75
47	78
48	81
49	84
50	87
51	88
52	89
53	90
54	93
55	94
56	95
57	96
58	97
59	98
60	99
61	102
62	105
63	108
64	111
65	112
66	113
67	114
68	117
69	118

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	12
11	13
12	14
13	15
14	18
15	19
16	20
17	21
18	24
19	27
20	28
21	29
22	30
23	33
24	34
25	35
26	36
27	39
28	42
29	45
30	48
31	49
32	50
33	51
34	52
35	53
36	54
37	60
38	63
39	66
40	67
41	68
42	69
43	72
44	73
45	74
46	75
47	78
48	81
49	84
50	87
51	88
52	89
53	90
54	93
55	94
56	95
57	96
58	97
59	98
60	99
61	102
62	105
63	108
64	111
65	112
66	113
67	114
68	117
69	118