A241533 - cp's OEIS frontend

A241533 Smallest prime p such that 2*prime(n) - p^2 is semiprime, or a(n)=0 if there is no such p.

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

[0, 0, 2, 2, 0, 2, 3, 2, 5, 3, 2, 3, 5, 2, 3, 7, 5, 2, 7, 3, 2, 5, 5, 3, 3, 5, 2, 3, 2, 3, 7, 3, 3, 2, 3, 2, 3, 5, 5, 5, 7, 2, 13, 2, 19, 2, 3, 3, 3, 2, 7, 3, 2, 3, 3, 3, 3, 2, 3, 3, 2, 7, 5, 5, 2, 0, 13, 5, 3, 2, 3, 7, 7, 3, 3, 7, 5, 3, 3, 5, 5, 2, 7, 2, 3, 13]

cp's OEIS Frontend

A241533 Smallest prime p such that 2*prime(n) - p^2 is semiprime, or a(n)=0 if there is no such p.

Table of values

List of values

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

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

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