A308044 - cp's OEIS frontend

A308044 a(n) = 2prevprime(2n-1) - 2*n, where prevprime(n) is the largest prime < n.

n	a(n)
2	0
3	0
4	2
5	4
6	2
7	8
8	10
9	8
10	14
11	16
12	14
13	20
14	18
15	16
16	26
17	28
18	26
19	24
20	34
21	32
22	38
23	40
24	38
25	44
26	42
27	40
28	50
29	48
30	46
31	56
32	58
33	56
34	54
35	64
36	62
37	68
38	70
39	68
40	66
41	76
42	74
43	80
44	78
45	76
46	86
47	84
48	82
49	80
50	94
51	92
52	98
53	100
54	98
55	104
56	106
57	104
58	110
59	108
60	106
61	104
62	102
63	100
64	98
65	124

[0, 0, 2, 4, 2, 8, 10, 8, 14, 16, 14, 20, 18, 16, 26, 28, 26, 24, 34, 32, 38, 40, 38, 44, 42, 40, 50, 48, 46, 56, 58, 56, 54, 64, 62, 68, 70, 68, 66, 76, 74, 80, 78, 76, 86, 84, 82, 80, 94, 92, 98, 100, 98, 104, 106, 104, 110, 108, 106, 104, 102, 100, 98, 124]

cp's OEIS Frontend

A308044 a(n) = 2prevprime(2n-1) - 2*n, where prevprime(n) is the largest prime < n.

Table of values

List of values

n	a(n)
2	0
3	0
4	2
5	4
6	2
7	8
8	10
9	8
10	14
11	16
12	14
13	20
14	18
15	16
16	26
17	28
18	26
19	24
20	34
21	32
22	38
23	40
24	38
25	44
26	42
27	40
28	50
29	48
30	46
31	56
32	58
33	56
34	54
35	64
36	62
37	68
38	70
39	68
40	66
41	76
42	74
43	80
44	78
45	76
46	86
47	84
48	82
49	80
50	94
51	92
52	98
53	100
54	98
55	104
56	106
57	104
58	110
59	108
60	106
61	104
62	102
63	100
64	98
65	124

n	a(n)
2	0
3	0
4	2
5	4
6	2
7	8
8	10
9	8
10	14
11	16
12	14
13	20
14	18
15	16
16	26
17	28
18	26
19	24
20	34
21	32
22	38
23	40
24	38
25	44
26	42
27	40
28	50
29	48
30	46
31	56
32	58
33	56
34	54
35	64
36	62
37	68
38	70
39	68
40	66
41	76
42	74
43	80
44	78
45	76
46	86
47	84
48	82
49	80
50	94
51	92
52	98
53	100
54	98
55	104
56	106
57	104
58	110
59	108
60	106
61	104
62	102
63	100
64	98
65	124

cp's OEIS Frontend

A308044 a(n) = 2*prevprime(2*n-1) - 2*n, where prevprime(n) is the largest prime < n.

Table of values

List of values

A308044 a(n) = 2prevprime(2n-1) - 2*n, where prevprime(n) is the largest prime < n.

n	a(n)
2	0
3	0
4	2
5	4
6	2
7	8
8	10
9	8
10	14
11	16
12	14
13	20
14	18
15	16
16	26
17	28
18	26
19	24
20	34
21	32
22	38
23	40
24	38
25	44
26	42
27	40
28	50
29	48
30	46
31	56
32	58
33	56
34	54
35	64
36	62
37	68
38	70
39	68
40	66
41	76
42	74
43	80
44	78
45	76
46	86
47	84
48	82
49	80
50	94
51	92
52	98
53	100
54	98
55	104
56	106
57	104
58	110
59	108
60	106
61	104
62	102
63	100
64	98
65	124