A055265 - cp's OEIS frontend

A055265 a(n) is the smallest positive integer not already in the sequence such that a(n)+a(n-1) is prime, starting with a(1)=1.

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	6
7	5
8	8
9	9
10	10
11	13
12	16
13	15
14	14
15	17
16	12
17	11
18	18
19	19
20	22
21	21
22	20
23	23
24	24
25	29
26	30
27	31
28	28
29	25
30	34
31	27
32	26
33	33
34	38
35	35
36	32
37	39
38	40
39	43
40	36
41	37
42	42
43	41
44	48
45	49
46	52
47	45
48	44
49	53
50	50
51	47
52	54
53	55
54	46
55	51
56	56
57	57
58	70
59	61
60	66
61	65
62	62
63	69
64	58
65	73
66	64
67	63
68	68
69	59
70	72
71	67
72	60

[1, 2, 3, 4, 7, 6, 5, 8, 9, 10, 13, 16, 15, 14, 17, 12, 11, 18, 19, 22, 21, 20, 23, 24, 29, 30, 31, 28, 25, 34, 27, 26, 33, 38, 35, 32, 39, 40, 43, 36, 37, 42, 41, 48, 49, 52, 45, 44, 53, 50, 47, 54, 55, 46, 51, 56, 57, 70, 61, 66, 65, 62, 69, 58, 73, 64, 63, 68, 59, 72, 67, 60]

cp's OEIS Frontend

A055265 a(n) is the smallest positive integer not already in the sequence such that a(n)+a(n-1) is prime, starting with a(1)=1.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	6
7	5
8	8
9	9
10	10
11	13
12	16
13	15
14	14
15	17
16	12
17	11
18	18
19	19
20	22
21	21
22	20
23	23
24	24
25	29
26	30
27	31
28	28
29	25
30	34
31	27
32	26
33	33
34	38
35	35
36	32
37	39
38	40
39	43
40	36
41	37
42	42
43	41
44	48
45	49
46	52
47	45
48	44
49	53
50	50
51	47
52	54
53	55
54	46
55	51
56	56
57	57
58	70
59	61
60	66
61	65
62	62
63	69
64	58
65	73
66	64
67	63
68	68
69	59
70	72
71	67
72	60

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	6
7	5
8	8
9	9
10	10
11	13
12	16
13	15
14	14
15	17
16	12
17	11
18	18
19	19
20	22
21	21
22	20
23	23
24	24
25	29
26	30
27	31
28	28
29	25
30	34
31	27
32	26
33	33
34	38
35	35
36	32
37	39
38	40
39	43
40	36
41	37
42	42
43	41
44	48
45	49
46	52
47	45
48	44
49	53
50	50
51	47
52	54
53	55
54	46
55	51
56	56
57	57
58	70
59	61
60	66
61	65
62	62
63	69
64	58
65	73
66	64
67	63
68	68
69	59
70	72
71	67
72	60

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	6
7	5
8	8
9	9
10	10
11	13
12	16
13	15
14	14
15	17
16	12
17	11
18	18
19	19
20	22
21	21
22	20
23	23
24	24
25	29
26	30
27	31
28	28
29	25
30	34
31	27
32	26
33	33
34	38
35	35
36	32
37	39
38	40
39	43
40	36
41	37
42	42
43	41
44	48
45	49
46	52
47	45
48	44
49	53
50	50
51	47
52	54
53	55
54	46
55	51
56	56
57	57
58	70
59	61
60	66
61	65
62	62
63	69
64	58
65	73
66	64
67	63
68	68
69	59
70	72
71	67
72	60