A133828 - cp's OEIS frontend

A133828 a(n) = the smallest "isolated divisor" of n, or 0 if no such divisor exists. A positive divisor, k, of n is isolated if neither (k-1) nor (k+1) divides n.

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

[1, 0, 1, 4, 1, 6, 1, 4, 1, 5, 1, 6, 1, 7, 1, 4, 1, 6, 1, 10, 1, 11, 1, 6, 1, 13, 1, 4, 1, 10, 1, 4, 1, 17, 1, 6, 1, 19, 1, 8, 1, 14, 1, 4, 1, 23, 1, 6, 1, 5, 1, 4, 1, 6, 1, 4, 1, 29, 1, 10, 1, 31, 1, 4, 1, 6, 1, 4, 1, 5, 1, 6, 1, 37, 1, 4, 1, 6, 1, 8, 1, 41, 1, 12, 1, 43, 1, 4, 1, 15, 1, 4, 1, 47, 1, 6, 1]

cp's OEIS Frontend

A133828 a(n) = the smallest "isolated divisor" of n, or 0 if no such divisor exists. A positive divisor, k, of n is isolated if neither (k-1) nor (k+1) divides n.

Table of values

List of values

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

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

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