A232109 - cp's OEIS frontend

A232109 Least prime p < n + 5 with n + (p-1)*(p-3)/8 prime, or 0 if such a prime p does not exist.

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

[5, 3, 3, 5, 3, 5, 3, 7, 11, 5, 3, 5, 3, 7, 17, 5, 3, 5, 3, 7, 11, 5, 3, 23, 17, 7, 11, 5, 3, 5, 3, 13, 11, 7, 19, 5, 3, 7, 17, 5, 3, 5, 3, 7, 17, 5, 3, 23, 11, 7, 11, 5, 3, 23, 17, 7, 11, 5, 3, 5, 3, 31, 11, 7, 19, 5, 3, 7, 11, 5, 3, 5, 3, 13, 17, 7, 19, 5, 3, 7, 17, 5, 3, 23, 17, 7, 11, 5, 3, 29, 11, 13, 11, 7, 19, 5, 3, 7, 11, 5]

cp's OEIS Frontend

A232109 Least prime p < n + 5 with n + (p-1)*(p-3)/8 prime, or 0 if such a prime p does not exist.

Table of values

List of values

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

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

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