A278923 - cp's OEIS frontend

A278923 Largest p such that 2n-1 = p + q + r with three primes p < q < r, or 0 if no such primes exist.

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

[0, 0, 0, 0, 0, 0, 0, 3, 0, 3, 3, 5, 5, 3, 5, 7, 5, 7, 7, 7, 11, 11, 5, 11, 13, 11, 13, 13, 11, 17, 13, 13, 17, 17, 17, 19, 19, 13, 17, 19, 17, 23, 19, 19, 23, 23, 23, 23, 29, 23, 29, 29, 23, 29, 31, 31, 29, 31, 29, 31, 37, 29, 37, 37, 31, 41, 37, 31, 41, 37, 41, 43, 41, 41, 43, 43, 41, 43, 43, 47, 47, 43, 41, 47, 43, 47, 53, 47, 47, 53, 53, 53, 53, 59, 47]

cp's OEIS Frontend

A278923 Largest p such that 2n-1 = p + q + r with three primes p < q < r, or 0 if no such primes exist.

Table of values

List of values

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

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

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