A103153 - cp's OEIS frontend

A103153 a(n) is the smallest odd prime p such that 2n+1 = 2p + A000040(k) for some k>1, or 0 if no such prime exists.

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

[0, 0, 0, 3, 3, 3, 5, 3, 3, 5, 3, 3, 5, 3, 7, 5, 3, 3, 5, 5, 3, 7, 3, 3, 5, 3, 7, 5, 3, 7, 5, 3, 3, 5, 5, 3, 7, 3, 3, 5, 5, 3, 7, 3, 19, 5, 3, 7, 5, 11, 3, 11, 3, 3, 5, 3, 3, 5, 3, 7, 5, 11, 7, 11, 11, 3, 11, 3, 13, 5, 3, 3, 5, 5, 7, 7, 3, 3, 5, 5, 3, 7, 5, 3, 7, 3, 13, 5, 3, 7, 5, 3, 3, 5, 5, 7, 7, 3]

cp's OEIS Frontend

A103153 a(n) is the smallest odd prime p such that 2n+1 = 2p + A000040(k) for some k>1, or 0 if no such prime exists.

Table of values

List of values

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

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

cp's OEIS Frontend

A103153 a(n) is the smallest odd prime p such that 2*n+1 = 2*p + A000040(k) for some k>1, or 0 if no such prime exists.

Table of values

List of values

A103153 a(n) is the smallest odd prime p such that 2n+1 = 2p + A000040(k) for some k>1, or 0 if no such prime exists.

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