A071194 - cp's OEIS frontend

A071194 Length (>1) of shortest sequence of consecutive primes starting with prime(n) whose sum is also prime, or -1 if no such sequence exists.

n	a(n)
1	2
2	9
3	3
4	3
5	3
6	5
7	3
8	3
9	3
10	3
11	3
12	9
13	3
14	5
15	7
16	3
17	5
18	3
19	3
20	3
21	5
22	3
23	3
24	7
25	7
26	3
27	7
28	5
29	3
30	5
31	5
32	9
33	5
34	3
35	3
36	5
37	3
38	3
39	11
40	9
41	5
42	21
43	5
44	9
45	3
46	9
47	3
48	5
49	55
50	3
51	7
52	27
53	9
54	27
55	7
56	5
57	5
58	3
59	9
60	3
61	3
62	3
63	5
64	3
65	7
66	7
67	11
68	3
69	3
70	3
71	5
72	5
73	7
74	7
75	3
76	5
77	3
78	9
79	3
80	3
81	5
82	11
83	3
84	5
85	47
86	5
87	3
88	3
89	5
90	3
91	3
92	5
93	7
94	3
95	3
96	7
97	3
98	5
99	5
100	5
101	3

[2, 9, 3, 3, 3, 5, 3, 3, 3, 3, 3, 9, 3, 5, 7, 3, 5, 3, 3, 3, 5, 3, 3, 7, 7, 3, 7, 5, 3, 5, 5, 9, 5, 3, 3, 5, 3, 3, 11, 9, 5, 21, 5, 9, 3, 9, 3, 5, 55, 3, 7, 27, 9, 27, 7, 5, 5, 3, 9, 3, 3, 3, 5, 3, 7, 7, 11, 3, 3, 3, 5, 5, 7, 7, 3, 5, 3, 9, 3, 3, 5, 11, 3, 5, 47, 5, 3, 3, 5, 3, 3, 5, 7, 3, 3, 7, 3, 5, 5, 5, 3]

cp's OEIS Frontend

A071194 Length (>1) of shortest sequence of consecutive primes starting with prime(n) whose sum is also prime, or -1 if no such sequence exists.

Table of values

List of values

n	a(n)
1	2
2	9
3	3
4	3
5	3
6	5
7	3
8	3
9	3
10	3
11	3
12	9
13	3
14	5
15	7
16	3
17	5
18	3
19	3
20	3
21	5
22	3
23	3
24	7
25	7
26	3
27	7
28	5
29	3
30	5
31	5
32	9
33	5
34	3
35	3
36	5
37	3
38	3
39	11
40	9
41	5
42	21
43	5
44	9
45	3
46	9
47	3
48	5
49	55
50	3
51	7
52	27
53	9
54	27
55	7
56	5
57	5
58	3
59	9
60	3
61	3
62	3
63	5
64	3
65	7
66	7
67	11
68	3
69	3
70	3
71	5
72	5
73	7
74	7
75	3
76	5
77	3
78	9
79	3
80	3
81	5
82	11
83	3
84	5
85	47
86	5
87	3
88	3
89	5
90	3
91	3
92	5
93	7
94	3
95	3
96	7
97	3
98	5
99	5
100	5
101	3

n	a(n)
1	2
2	9
3	3
4	3
5	3
6	5
7	3
8	3
9	3
10	3
11	3
12	9
13	3
14	5
15	7
16	3
17	5
18	3
19	3
20	3
21	5
22	3
23	3
24	7
25	7
26	3
27	7
28	5
29	3
30	5
31	5
32	9
33	5
34	3
35	3
36	5
37	3
38	3
39	11
40	9
41	5
42	21
43	5
44	9
45	3
46	9
47	3
48	5
49	55
50	3
51	7
52	27
53	9
54	27
55	7
56	5
57	5
58	3
59	9
60	3
61	3
62	3
63	5
64	3
65	7
66	7
67	11
68	3
69	3
70	3
71	5
72	5
73	7
74	7
75	3
76	5
77	3
78	9
79	3
80	3
81	5
82	11
83	3
84	5
85	47
86	5
87	3
88	3
89	5
90	3
91	3
92	5
93	7
94	3
95	3
96	7
97	3
98	5
99	5
100	5
101	3

n	a(n)
1	2
2	9
3	3
4	3
5	3
6	5
7	3
8	3
9	3
10	3
11	3
12	9
13	3
14	5
15	7
16	3
17	5
18	3
19	3
20	3
21	5
22	3
23	3
24	7
25	7
26	3
27	7
28	5
29	3
30	5
31	5
32	9
33	5
34	3
35	3
36	5
37	3
38	3
39	11
40	9
41	5
42	21
43	5
44	9
45	3
46	9
47	3
48	5
49	55
50	3
51	7
52	27
53	9
54	27
55	7
56	5
57	5
58	3
59	9
60	3
61	3
62	3
63	5
64	3
65	7
66	7
67	11
68	3
69	3
70	3
71	5
72	5
73	7
74	7
75	3
76	5
77	3
78	9
79	3
80	3
81	5
82	11
83	3
84	5
85	47
86	5
87	3
88	3
89	5
90	3
91	3
92	5
93	7
94	3
95	3
96	7
97	3
98	5
99	5
100	5
101	3