A381031 - cp's OEIS frontend

A381031 The second smallest prime not dividing n minus the smallest prime not dividing n.

n	a(n)
1	1
2	2
3	3
4	2
5	1
6	2
7	1
8	2
9	3
10	4
11	1
12	2
13	1
14	2
15	5
16	2
17	1
18	2
19	1
20	4
21	3
22	2
23	1
24	2
25	1
26	2
27	3
28	2
29	1
30	4
31	1
32	2
33	3
34	2
35	1
36	2
37	1
38	2
39	3
40	4
41	1
42	6
43	1
44	2
45	5
46	2
47	1
48	2
49	1
50	4
51	3
52	2
53	1
54	2
55	1
56	2
57	3
58	2
59	1
60	4
61	1
62	2
63	3
64	2
65	1
66	2
67	1
68	2
69	3
70	8
71	1
72	2
73	1
74	2
75	5
76	2
77	1
78	2
79	1
80	4
81	3
82	2
83	1
84	6
85	1
86	2
87	3
88	2
89	1
90	4
91	1
92	2
93	3
94	2
95	1
96	2
97	1
98	2
99	3
100	4
101	1
102	2
103	1
104	2
105	9

[1, 2, 3, 2, 1, 2, 1, 2, 3, 4, 1, 2, 1, 2, 5, 2, 1, 2, 1, 4, 3, 2, 1, 2, 1, 2, 3, 2, 1, 4, 1, 2, 3, 2, 1, 2, 1, 2, 3, 4, 1, 6, 1, 2, 5, 2, 1, 2, 1, 4, 3, 2, 1, 2, 1, 2, 3, 2, 1, 4, 1, 2, 3, 2, 1, 2, 1, 2, 3, 8, 1, 2, 1, 2, 5, 2, 1, 2, 1, 4, 3, 2, 1, 6, 1, 2, 3, 2, 1, 4, 1, 2, 3, 2, 1, 2, 1, 2, 3, 4, 1, 2, 1, 2, 9]

cp's OEIS Frontend

A381031 The second smallest prime not dividing n minus the smallest prime not dividing n.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	2
5	1
6	2
7	1
8	2
9	3
10	4
11	1
12	2
13	1
14	2
15	5
16	2
17	1
18	2
19	1
20	4
21	3
22	2
23	1
24	2
25	1
26	2
27	3
28	2
29	1
30	4
31	1
32	2
33	3
34	2
35	1
36	2
37	1
38	2
39	3
40	4
41	1
42	6
43	1
44	2
45	5
46	2
47	1
48	2
49	1
50	4
51	3
52	2
53	1
54	2
55	1
56	2
57	3
58	2
59	1
60	4
61	1
62	2
63	3
64	2
65	1
66	2
67	1
68	2
69	3
70	8
71	1
72	2
73	1
74	2
75	5
76	2
77	1
78	2
79	1
80	4
81	3
82	2
83	1
84	6
85	1
86	2
87	3
88	2
89	1
90	4
91	1
92	2
93	3
94	2
95	1
96	2
97	1
98	2
99	3
100	4
101	1
102	2
103	1
104	2
105	9

n	a(n)
1	1
2	2
3	3
4	2
5	1
6	2
7	1
8	2
9	3
10	4
11	1
12	2
13	1
14	2
15	5
16	2
17	1
18	2
19	1
20	4
21	3
22	2
23	1
24	2
25	1
26	2
27	3
28	2
29	1
30	4
31	1
32	2
33	3
34	2
35	1
36	2
37	1
38	2
39	3
40	4
41	1
42	6
43	1
44	2
45	5
46	2
47	1
48	2
49	1
50	4
51	3
52	2
53	1
54	2
55	1
56	2
57	3
58	2
59	1
60	4
61	1
62	2
63	3
64	2
65	1
66	2
67	1
68	2
69	3
70	8
71	1
72	2
73	1
74	2
75	5
76	2
77	1
78	2
79	1
80	4
81	3
82	2
83	1
84	6
85	1
86	2
87	3
88	2
89	1
90	4
91	1
92	2
93	3
94	2
95	1
96	2
97	1
98	2
99	3
100	4
101	1
102	2
103	1
104	2
105	9

n	a(n)
1	1
2	2
3	3
4	2
5	1
6	2
7	1
8	2
9	3
10	4
11	1
12	2
13	1
14	2
15	5
16	2
17	1
18	2
19	1
20	4
21	3
22	2
23	1
24	2
25	1
26	2
27	3
28	2
29	1
30	4
31	1
32	2
33	3
34	2
35	1
36	2
37	1
38	2
39	3
40	4
41	1
42	6
43	1
44	2
45	5
46	2
47	1
48	2
49	1
50	4
51	3
52	2
53	1
54	2
55	1
56	2
57	3
58	2
59	1
60	4
61	1
62	2
63	3
64	2
65	1
66	2
67	1
68	2
69	3
70	8
71	1
72	2
73	1
74	2
75	5
76	2
77	1
78	2
79	1
80	4
81	3
82	2
83	1
84	6
85	1
86	2
87	3
88	2
89	1
90	4
91	1
92	2
93	3
94	2
95	1
96	2
97	1
98	2
99	3
100	4
101	1
102	2
103	1
104	2
105	9