A210444 - cp's OEIS frontend

A210444 a(n) = |{0 is practical, kn-1 and kn+1 are twin primes}|.

n	a(n)
1	0
2	0
3	1
4	2
5	0
6	4
7	1
8	0
9	2
10	2
11	0
12	4
13	0
14	1
15	4
16	2
17	0
18	6
19	1
20	3
21	2
22	2
23	0
24	5
25	2
26	1
27	3
28	1
29	2
30	11
31	0
32	1
33	4
34	1
35	2
36	6
37	0
38	2
39	4
40	3
41	1
42	9
43	2
44	3
45	4
46	2
47	0
48	7
49	1
50	4
51	4
52	5
53	0
54	8
55	4
56	1
57	3
58	3
59	0
60	15
61	0
62	3
63	4
64	4
65	4
66	13
67	2
68	4
69	2
70	5
71	2
72	10
73	0
74	2
75	11
76	2
77	3
78	12
79	0
80	6
81	6
82	2
83	2
84	13
85	3
86	5
87	7
88	5
89	1
90	16
91	4
92	4
93	6
94	3
95	2
96	11
97	0
98	8
99	6
100	7

[0, 0, 1, 2, 0, 4, 1, 0, 2, 2, 0, 4, 0, 1, 4, 2, 0, 6, 1, 3, 2, 2, 0, 5, 2, 1, 3, 1, 2, 11, 0, 1, 4, 1, 2, 6, 0, 2, 4, 3, 1, 9, 2, 3, 4, 2, 0, 7, 1, 4, 4, 5, 0, 8, 4, 1, 3, 3, 0, 15, 0, 3, 4, 4, 4, 13, 2, 4, 2, 5, 2, 10, 0, 2, 11, 2, 3, 12, 0, 6, 6, 2, 2, 13, 3, 5, 7, 5, 1, 16, 4, 4, 6, 3, 2, 11, 0, 8, 6, 7]

cp's OEIS Frontend

A210444 a(n) = |{0 is practical, kn-1 and kn+1 are twin primes}|.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	2
5	0
6	4
7	1
8	0
9	2
10	2
11	0
12	4
13	0
14	1
15	4
16	2
17	0
18	6
19	1
20	3
21	2
22	2
23	0
24	5
25	2
26	1
27	3
28	1
29	2
30	11
31	0
32	1
33	4
34	1
35	2
36	6
37	0
38	2
39	4
40	3
41	1
42	9
43	2
44	3
45	4
46	2
47	0
48	7
49	1
50	4
51	4
52	5
53	0
54	8
55	4
56	1
57	3
58	3
59	0
60	15
61	0
62	3
63	4
64	4
65	4
66	13
67	2
68	4
69	2
70	5
71	2
72	10
73	0
74	2
75	11
76	2
77	3
78	12
79	0
80	6
81	6
82	2
83	2
84	13
85	3
86	5
87	7
88	5
89	1
90	16
91	4
92	4
93	6
94	3
95	2
96	11
97	0
98	8
99	6
100	7

n	a(n)
1	0
2	0
3	1
4	2
5	0
6	4
7	1
8	0
9	2
10	2
11	0
12	4
13	0
14	1
15	4
16	2
17	0
18	6
19	1
20	3
21	2
22	2
23	0
24	5
25	2
26	1
27	3
28	1
29	2
30	11
31	0
32	1
33	4
34	1
35	2
36	6
37	0
38	2
39	4
40	3
41	1
42	9
43	2
44	3
45	4
46	2
47	0
48	7
49	1
50	4
51	4
52	5
53	0
54	8
55	4
56	1
57	3
58	3
59	0
60	15
61	0
62	3
63	4
64	4
65	4
66	13
67	2
68	4
69	2
70	5
71	2
72	10
73	0
74	2
75	11
76	2
77	3
78	12
79	0
80	6
81	6
82	2
83	2
84	13
85	3
86	5
87	7
88	5
89	1
90	16
91	4
92	4
93	6
94	3
95	2
96	11
97	0
98	8
99	6
100	7

cp's OEIS Frontend

A210444 a(n) = |{0 is practical, k*n-1 and k*n+1 are twin primes}|.

Table of values

List of values

A210444 a(n) = |{0 is practical, kn-1 and kn+1 are twin primes}|.

n	a(n)
1	0
2	0
3	1
4	2
5	0
6	4
7	1
8	0
9	2
10	2
11	0
12	4
13	0
14	1
15	4
16	2
17	0
18	6
19	1
20	3
21	2
22	2
23	0
24	5
25	2
26	1
27	3
28	1
29	2
30	11
31	0
32	1
33	4
34	1
35	2
36	6
37	0
38	2
39	4
40	3
41	1
42	9
43	2
44	3
45	4
46	2
47	0
48	7
49	1
50	4
51	4
52	5
53	0
54	8
55	4
56	1
57	3
58	3
59	0
60	15
61	0
62	3
63	4
64	4
65	4
66	13
67	2
68	4
69	2
70	5
71	2
72	10
73	0
74	2
75	11
76	2
77	3
78	12
79	0
80	6
81	6
82	2
83	2
84	13
85	3
86	5
87	7
88	5
89	1
90	16
91	4
92	4
93	6
94	3
95	2
96	11
97	0
98	8
99	6
100	7