A175320 - cp's OEIS frontend

A175320 Positive integers which cannot be represented as half-sums (averages) of two primes with indices that are primes with prime indices.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	9
8	10
9	12
10	13
11	14
12	15
13	16
14	17
15	19
16	20
17	22
18	23
19	24
20	25
21	26
22	27
23	28
24	29
25	30
26	33
27	34
28	36
29	37
30	38
31	39
32	40
33	41
34	42
35	43
36	44
37	46
38	47
39	48
40	49
41	50
42	51
43	52
44	53
45	54
46	55
47	56
48	57
49	58
50	60
51	61
52	62
53	63
54	64
55	65
56	67
57	68
58	70
59	71
60	72
61	73
62	74
63	75
64	76
65	77
66	78
67	80
68	81
69	82
70	83
71	84
72	85

[1, 2, 3, 4, 6, 7, 9, 10, 12, 13, 14, 15, 16, 17, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 33, 34, 36, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 65, 67, 68, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85]

cp's OEIS Frontend

A175320 Positive integers which cannot be represented as half-sums (averages) of two primes with indices that are primes with prime indices.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	9
8	10
9	12
10	13
11	14
12	15
13	16
14	17
15	19
16	20
17	22
18	23
19	24
20	25
21	26
22	27
23	28
24	29
25	30
26	33
27	34
28	36
29	37
30	38
31	39
32	40
33	41
34	42
35	43
36	44
37	46
38	47
39	48
40	49
41	50
42	51
43	52
44	53
45	54
46	55
47	56
48	57
49	58
50	60
51	61
52	62
53	63
54	64
55	65
56	67
57	68
58	70
59	71
60	72
61	73
62	74
63	75
64	76
65	77
66	78
67	80
68	81
69	82
70	83
71	84
72	85

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	9
8	10
9	12
10	13
11	14
12	15
13	16
14	17
15	19
16	20
17	22
18	23
19	24
20	25
21	26
22	27
23	28
24	29
25	30
26	33
27	34
28	36
29	37
30	38
31	39
32	40
33	41
34	42
35	43
36	44
37	46
38	47
39	48
40	49
41	50
42	51
43	52
44	53
45	54
46	55
47	56
48	57
49	58
50	60
51	61
52	62
53	63
54	64
55	65
56	67
57	68
58	70
59	71
60	72
61	73
62	74
63	75
64	76
65	77
66	78
67	80
68	81
69	82
70	83
71	84
72	85

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	9
8	10
9	12
10	13
11	14
12	15
13	16
14	17
15	19
16	20
17	22
18	23
19	24
20	25
21	26
22	27
23	28
24	29
25	30
26	33
27	34
28	36
29	37
30	38
31	39
32	40
33	41
34	42
35	43
36	44
37	46
38	47
39	48
40	49
41	50
42	51
43	52
44	53
45	54
46	55
47	56
48	57
49	58
50	60
51	61
52	62
53	63
54	64
55	65
56	67
57	68
58	70
59	71
60	72
61	73
62	74
63	75
64	76
65	77
66	78
67	80
68	81
69	82
70	83
71	84
72	85