A175509 - cp's OEIS frontend

A175509 a(n) = ((2n)-th semiprime) minus 2(n-th semiprime).

n	a(n)
1	-2
2	-2
3	-3
4	2
5	-2
6	4
7	-4
8	2
9	1
10	5
11	-4
12	1
13	7
14	9
15	9
16	1
17	-3
18	9
19	8
20	7
21	7
22	9
23	11
24	5
25	-2
26	4
27	-3
28	-1
29	6
30	11
31	12
32	16
33	17
34	19
35	2
36	-5
37	-11
38	-10
39	-1
40	7
41	10
42	16
43	9
44	12
45	21
46	13
47	15
48	16
49	15
50	22
51	11
52	10
53	11
54	13
55	9
56	17
57	7
58	9
59	11
60	12
61	17
62	6
63	-4
64	3
65	7
66	7
67	15
68	27
69	21
70	25
71	28
72	35
73	37
74	43
75	43
76	41
77	31
78	31
79	20

[-2, -2, -3, 2, -2, 4, -4, 2, 1, 5, -4, 1, 7, 9, 9, 1, -3, 9, 8, 7, 7, 9, 11, 5, -2, 4, -3, -1, 6, 11, 12, 16, 17, 19, 2, -5, -11, -10, -1, 7, 10, 16, 9, 12, 21, 13, 15, 16, 15, 22, 11, 10, 11, 13, 9, 17, 7, 9, 11, 12, 17, 6, -4, 3, 7, 7, 15, 27, 21, 25, 28, 35, 37, 43, 43, 41, 31, 31, 20]

cp's OEIS Frontend

A175509 a(n) = ((2n)-th semiprime) minus 2(n-th semiprime).

Table of values

List of values

n	a(n)
1	-2
2	-2
3	-3
4	2
5	-2
6	4
7	-4
8	2
9	1
10	5
11	-4
12	1
13	7
14	9
15	9
16	1
17	-3
18	9
19	8
20	7
21	7
22	9
23	11
24	5
25	-2
26	4
27	-3
28	-1
29	6
30	11
31	12
32	16
33	17
34	19
35	2
36	-5
37	-11
38	-10
39	-1
40	7
41	10
42	16
43	9
44	12
45	21
46	13
47	15
48	16
49	15
50	22
51	11
52	10
53	11
54	13
55	9
56	17
57	7
58	9
59	11
60	12
61	17
62	6
63	-4
64	3
65	7
66	7
67	15
68	27
69	21
70	25
71	28
72	35
73	37
74	43
75	43
76	41
77	31
78	31
79	20

n	a(n)
1	-2
2	-2
3	-3
4	2
5	-2
6	4
7	-4
8	2
9	1
10	5
11	-4
12	1
13	7
14	9
15	9
16	1
17	-3
18	9
19	8
20	7
21	7
22	9
23	11
24	5
25	-2
26	4
27	-3
28	-1
29	6
30	11
31	12
32	16
33	17
34	19
35	2
36	-5
37	-11
38	-10
39	-1
40	7
41	10
42	16
43	9
44	12
45	21
46	13
47	15
48	16
49	15
50	22
51	11
52	10
53	11
54	13
55	9
56	17
57	7
58	9
59	11
60	12
61	17
62	6
63	-4
64	3
65	7
66	7
67	15
68	27
69	21
70	25
71	28
72	35
73	37
74	43
75	43
76	41
77	31
78	31
79	20

cp's OEIS Frontend

A175509 a(n) = ((2*n)-th semiprime) minus 2*(n-th semiprime).

Table of values

List of values

A175509 a(n) = ((2n)-th semiprime) minus 2(n-th semiprime).

n	a(n)
1	-2
2	-2
3	-3
4	2
5	-2
6	4
7	-4
8	2
9	1
10	5
11	-4
12	1
13	7
14	9
15	9
16	1
17	-3
18	9
19	8
20	7
21	7
22	9
23	11
24	5
25	-2
26	4
27	-3
28	-1
29	6
30	11
31	12
32	16
33	17
34	19
35	2
36	-5
37	-11
38	-10
39	-1
40	7
41	10
42	16
43	9
44	12
45	21
46	13
47	15
48	16
49	15
50	22
51	11
52	10
53	11
54	13
55	9
56	17
57	7
58	9
59	11
60	12
61	17
62	6
63	-4
64	3
65	7
66	7
67	15
68	27
69	21
70	25
71	28
72	35
73	37
74	43
75	43
76	41
77	31
78	31
79	20