A076990 - cp's OEIS frontend

A076990 a(1) = 1, a(2) = 2; thereafter a(n) = smallest number not occurring earlier such that the sum of three successive terms is prime.

n	a(n)
1	1
2	2
3	4
4	5
5	8
6	6
7	3
8	10
9	16
10	11
11	14
12	12
13	15
14	20
15	18
16	9
17	26
18	24
19	17
20	30
21	32
22	21
23	36
24	22
25	13
26	38
27	28
28	7
29	44
30	46
31	19
32	42
33	40
34	25
35	48
36	34
37	27
38	52
39	58
40	29
41	50
42	60
43	39
44	64
45	54
46	31
47	66
48	70
49	37
50	56
51	74
52	33
53	72
54	62
55	23
56	78
57	80
58	35
59	76
60	68
61	47
62	82
63	94
64	51
65	84
66	88
67	55
68	86
69	92
70	45
71	90
72	98

[1, 2, 4, 5, 8, 6, 3, 10, 16, 11, 14, 12, 15, 20, 18, 9, 26, 24, 17, 30, 32, 21, 36, 22, 13, 38, 28, 7, 44, 46, 19, 42, 40, 25, 48, 34, 27, 52, 58, 29, 50, 60, 39, 64, 54, 31, 66, 70, 37, 56, 74, 33, 72, 62, 23, 78, 80, 35, 76, 68, 47, 82, 94, 51, 84, 88, 55, 86, 92, 45, 90, 98]

cp's OEIS Frontend

A076990 a(1) = 1, a(2) = 2; thereafter a(n) = smallest number not occurring earlier such that the sum of three successive terms is prime.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	5
5	8
6	6
7	3
8	10
9	16
10	11
11	14
12	12
13	15
14	20
15	18
16	9
17	26
18	24
19	17
20	30
21	32
22	21
23	36
24	22
25	13
26	38
27	28
28	7
29	44
30	46
31	19
32	42
33	40
34	25
35	48
36	34
37	27
38	52
39	58
40	29
41	50
42	60
43	39
44	64
45	54
46	31
47	66
48	70
49	37
50	56
51	74
52	33
53	72
54	62
55	23
56	78
57	80
58	35
59	76
60	68
61	47
62	82
63	94
64	51
65	84
66	88
67	55
68	86
69	92
70	45
71	90
72	98

n	a(n)
1	1
2	2
3	4
4	5
5	8
6	6
7	3
8	10
9	16
10	11
11	14
12	12
13	15
14	20
15	18
16	9
17	26
18	24
19	17
20	30
21	32
22	21
23	36
24	22
25	13
26	38
27	28
28	7
29	44
30	46
31	19
32	42
33	40
34	25
35	48
36	34
37	27
38	52
39	58
40	29
41	50
42	60
43	39
44	64
45	54
46	31
47	66
48	70
49	37
50	56
51	74
52	33
53	72
54	62
55	23
56	78
57	80
58	35
59	76
60	68
61	47
62	82
63	94
64	51
65	84
66	88
67	55
68	86
69	92
70	45
71	90
72	98

n	a(n)
1	1
2	2
3	4
4	5
5	8
6	6
7	3
8	10
9	16
10	11
11	14
12	12
13	15
14	20
15	18
16	9
17	26
18	24
19	17
20	30
21	32
22	21
23	36
24	22
25	13
26	38
27	28
28	7
29	44
30	46
31	19
32	42
33	40
34	25
35	48
36	34
37	27
38	52
39	58
40	29
41	50
42	60
43	39
44	64
45	54
46	31
47	66
48	70
49	37
50	56
51	74
52	33
53	72
54	62
55	23
56	78
57	80
58	35
59	76
60	68
61	47
62	82
63	94
64	51
65	84
66	88
67	55
68	86
69	92
70	45
71	90
72	98