A174960 - cp's OEIS frontend

A174960 Smallest prime p such that p + n*(n+1)/2 is prime, or 0 if no such prime exists.

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

[2, 2, 2, 5, 3, 2, 2, 3, 5, 2, 0, 5, 5, 0, 2, 7, 3, 0, 2, 3, 13, 2, 0, 5, 7, 0, 2, 5, 3, 0, 2, 3, 13, 2, 0, 11, 7, 0, 2, 7, 3, 2, 0, 7, 7, 0, 0, 23, 5, 0, 2, 41, 3, 2, 2, 3, 5, 0, 0, 7, 17, 0, 0, 11, 3, 0, 2, 3, 5, 2, 0, 23, 5, 0, 2, 7, 13, 0, 2, 3, 11, 2, 0, 5, 11, 0, 0, 5, 3, 2, 0, 31, 5, 2, 0, 7, 7, 0, 0]

cp's OEIS Frontend

A174960 Smallest prime p such that p + n*(n+1)/2 is prime, or 0 if no such prime exists.

Table of values

List of values

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

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

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