A086131 - cp's OEIS frontend

A086131 Largest prime factor of arithmetic derivative of n if it exists, or a(n)=0 for n=1 and n=prime.

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

[0, 0, 0, 2, 0, 5, 0, 3, 3, 7, 0, 2, 0, 3, 2, 2, 0, 7, 0, 3, 5, 13, 0, 11, 5, 5, 3, 2, 0, 31, 0, 5, 7, 19, 3, 5, 0, 7, 2, 17, 0, 41, 0, 3, 13, 5, 0, 7, 7, 5, 5, 7, 0, 3, 2, 23, 11, 31, 0, 23, 0, 11, 17, 3, 3, 61, 0, 3, 13, 59, 0, 13, 0, 13, 11, 5, 3, 71, 0, 11, 3, 43, 0, 31, 11, 5, 2, 7, 0, 41, 5, 3]

cp's OEIS Frontend

A086131 Largest prime factor of arithmetic derivative of n if it exists, or a(n)=0 for n=1 and n=prime.

Table of values

List of values

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

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

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