A329273 - cp's OEIS frontend

A329273 a(1)=1. If n is prime, a(n)=0; if not, a(n) = (the smallest prime number greater than n) minus (the largest prime number smaller than n) minus 1.

n	a(n)
1	1
2	0
3	0
4	1
5	0
6	1
7	0
8	3
9	3
10	3
11	0
12	1
13	0
14	3
15	3
16	3
17	0
18	1
19	0
20	3
21	3
22	3
23	0
24	5
25	5
26	5
27	5
28	5
29	0
30	1
31	0
32	5
33	5
34	5
35	5
36	5
37	0
38	3
39	3
40	3
41	0
42	1
43	0
44	3
45	3
46	3
47	0
48	5
49	5
50	5
51	5
52	5
53	0
54	5
55	5
56	5
57	5
58	5
59	0
60	1
61	0
62	5
63	5
64	5
65	5
66	5
67	0
68	3
69	3
70	3
71	0
72	1
73	0
74	5
75	5
76	5
77	5
78	5
79	0
80	3
81	3
82	3
83	0
84	5
85	5
86	5
87	5
88	5
89	0
90	7
91	7
92	7
93	7
94	7
95	7
96	7
97	0
98	3
99	3
100	3

[1, 0, 0, 1, 0, 1, 0, 3, 3, 3, 0, 1, 0, 3, 3, 3, 0, 1, 0, 3, 3, 3, 0, 5, 5, 5, 5, 5, 0, 1, 0, 5, 5, 5, 5, 5, 0, 3, 3, 3, 0, 1, 0, 3, 3, 3, 0, 5, 5, 5, 5, 5, 0, 5, 5, 5, 5, 5, 0, 1, 0, 5, 5, 5, 5, 5, 0, 3, 3, 3, 0, 1, 0, 5, 5, 5, 5, 5, 0, 3, 3, 3, 0, 5, 5, 5, 5, 5, 0, 7, 7, 7, 7, 7, 7, 7, 0, 3, 3, 3]

cp's OEIS Frontend

A329273 a(1)=1. If n is prime, a(n)=0; if not, a(n) = (the smallest prime number greater than n) minus (the largest prime number smaller than n) minus 1.

Table of values

List of values

n	a(n)
1	1
2	0
3	0
4	1
5	0
6	1
7	0
8	3
9	3
10	3
11	0
12	1
13	0
14	3
15	3
16	3
17	0
18	1
19	0
20	3
21	3
22	3
23	0
24	5
25	5
26	5
27	5
28	5
29	0
30	1
31	0
32	5
33	5
34	5
35	5
36	5
37	0
38	3
39	3
40	3
41	0
42	1
43	0
44	3
45	3
46	3
47	0
48	5
49	5
50	5
51	5
52	5
53	0
54	5
55	5
56	5
57	5
58	5
59	0
60	1
61	0
62	5
63	5
64	5
65	5
66	5
67	0
68	3
69	3
70	3
71	0
72	1
73	0
74	5
75	5
76	5
77	5
78	5
79	0
80	3
81	3
82	3
83	0
84	5
85	5
86	5
87	5
88	5
89	0
90	7
91	7
92	7
93	7
94	7
95	7
96	7
97	0
98	3
99	3
100	3

n	a(n)
1	1
2	0
3	0
4	1
5	0
6	1
7	0
8	3
9	3
10	3
11	0
12	1
13	0
14	3
15	3
16	3
17	0
18	1
19	0
20	3
21	3
22	3
23	0
24	5
25	5
26	5
27	5
28	5
29	0
30	1
31	0
32	5
33	5
34	5
35	5
36	5
37	0
38	3
39	3
40	3
41	0
42	1
43	0
44	3
45	3
46	3
47	0
48	5
49	5
50	5
51	5
52	5
53	0
54	5
55	5
56	5
57	5
58	5
59	0
60	1
61	0
62	5
63	5
64	5
65	5
66	5
67	0
68	3
69	3
70	3
71	0
72	1
73	0
74	5
75	5
76	5
77	5
78	5
79	0
80	3
81	3
82	3
83	0
84	5
85	5
86	5
87	5
88	5
89	0
90	7
91	7
92	7
93	7
94	7
95	7
96	7
97	0
98	3
99	3
100	3

n	a(n)
1	1
2	0
3	0
4	1
5	0
6	1
7	0
8	3
9	3
10	3
11	0
12	1
13	0
14	3
15	3
16	3
17	0
18	1
19	0
20	3
21	3
22	3
23	0
24	5
25	5
26	5
27	5
28	5
29	0
30	1
31	0
32	5
33	5
34	5
35	5
36	5
37	0
38	3
39	3
40	3
41	0
42	1
43	0
44	3
45	3
46	3
47	0
48	5
49	5
50	5
51	5
52	5
53	0
54	5
55	5
56	5
57	5
58	5
59	0
60	1
61	0
62	5
63	5
64	5
65	5
66	5
67	0
68	3
69	3
70	3
71	0
72	1
73	0
74	5
75	5
76	5
77	5
78	5
79	0
80	3
81	3
82	3
83	0
84	5
85	5
86	5
87	5
88	5
89	0
90	7
91	7
92	7
93	7
94	7
95	7
96	7
97	0
98	3
99	3
100	3