A278425 - cp's OEIS frontend

A278425 Largest k such that there are no primes between kn and k(n+1); -1 if no such k exists.

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

[1, 1, 1, 2, 1, 4, 2, 4, 1, 2, 3, 4, 9, 1, 6, 3, 7, 5, 6, 10, 4, 2, 5, 5, 8, 7, 2, 5, 11, 4, 3, 10, 9, 6, 15, 6, 8, 4, 3, 8, 5, 7, 5, 12, 2, 7, 3, 11, 6, 6, 10, 9, 10, 6, 2, 3, 5, 23, 9, 6, 4, 10, 4, 8, 6, 8, 20, 5, 9, 19, 4, 12, 7, 18, 7, 7, 2, 6, 17, 6, 14, 6, 16, 16, 6, 9, 13, 19, 15, 14, 18, 4, 18, 5, 14, 14, 13, 4, 9, 8]

cp's OEIS Frontend

A278425 Largest k such that there are no primes between kn and k(n+1); -1 if no such k exists.

Table of values

List of values

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

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

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