A040040 - cp's OEIS frontend

A040040 Average of twin prime pairs (A014574), divided by 2. Equivalently, 2a(n)-1 and 2a(n)+1 are primes.

n	a(n)
1	2
2	3
3	6
4	9
5	15
6	21
7	30
8	36
9	51
10	54
11	69
12	75
13	90
14	96
15	99
16	114
17	120
18	135
19	141
20	156
21	174
22	210
23	216
24	231
25	261
26	285
27	300
28	309
29	321
30	330
31	405
32	411
33	414
34	429
35	441
36	510
37	516
38	525
39	531
40	546
41	576
42	615
43	639
44	645
45	651
46	660
47	714
48	726
49	741
50	744
51	804
52	810
53	834
54	849
55	861
56	894

[2, 3, 6, 9, 15, 21, 30, 36, 51, 54, 69, 75, 90, 96, 99, 114, 120, 135, 141, 156, 174, 210, 216, 231, 261, 285, 300, 309, 321, 330, 405, 411, 414, 429, 441, 510, 516, 525, 531, 546, 576, 615, 639, 645, 651, 660, 714, 726, 741, 744, 804, 810, 834, 849, 861, 894]

cp's OEIS Frontend

A040040 Average of twin prime pairs (A014574), divided by 2. Equivalently, 2a(n)-1 and 2a(n)+1 are primes.

Table of values

List of values

n	a(n)
1	2
2	3
3	6
4	9
5	15
6	21
7	30
8	36
9	51
10	54
11	69
12	75
13	90
14	96
15	99
16	114
17	120
18	135
19	141
20	156
21	174
22	210
23	216
24	231
25	261
26	285
27	300
28	309
29	321
30	330
31	405
32	411
33	414
34	429
35	441
36	510
37	516
38	525
39	531
40	546
41	576
42	615
43	639
44	645
45	651
46	660
47	714
48	726
49	741
50	744
51	804
52	810
53	834
54	849
55	861
56	894

n	a(n)
1	2
2	3
3	6
4	9
5	15
6	21
7	30
8	36
9	51
10	54
11	69
12	75
13	90
14	96
15	99
16	114
17	120
18	135
19	141
20	156
21	174
22	210
23	216
24	231
25	261
26	285
27	300
28	309
29	321
30	330
31	405
32	411
33	414
34	429
35	441
36	510
37	516
38	525
39	531
40	546
41	576
42	615
43	639
44	645
45	651
46	660
47	714
48	726
49	741
50	744
51	804
52	810
53	834
54	849
55	861
56	894

cp's OEIS Frontend

A040040 Average of twin prime pairs (A014574), divided by 2. Equivalently, 2*a(n)-1 and 2*a(n)+1 are primes.

Table of values

List of values

A040040 Average of twin prime pairs (A014574), divided by 2. Equivalently, 2a(n)-1 and 2a(n)+1 are primes.

n	a(n)
1	2
2	3
3	6
4	9
5	15
6	21
7	30
8	36
9	51
10	54
11	69
12	75
13	90
14	96
15	99
16	114
17	120
18	135
19	141
20	156
21	174
22	210
23	216
24	231
25	261
26	285
27	300
28	309
29	321
30	330
31	405
32	411
33	414
34	429
35	441
36	510
37	516
38	525
39	531
40	546
41	576
42	615
43	639
44	645
45	651
46	660
47	714
48	726
49	741
50	744
51	804
52	810
53	834
54	849
55	861
56	894