A357039 - cp's OEIS frontend

A357039 Number of integer solutions to x' = 2n, where x' is the arithmetic derivative of x.

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

[0, 1, 1, 1, 2, 2, 2, 3, 2, 2, 3, 4, 3, 2, 3, 4, 4, 4, 2, 3, 4, 4, 4, 6, 4, 3, 5, 4, 4, 7, 3, 5, 6, 3, 5, 7, 5, 5, 7, 6, 5, 8, 5, 4, 9, 6, 5, 8, 3, 6, 8, 5, 6, 9, 6, 8, 10, 6, 6, 13, 4, 6, 10, 4, 7, 9, 6, 5, 8, 9, 8, 11, 6, 5, 12, 5, 8, 12, 5, 8, 11, 6, 6, 14, 9, 6, 11, 9, 7, 14, 6, 8, 13, 7, 8, 13, 7, 9, 13, 8]

cp's OEIS Frontend

A357039 Number of integer solutions to x' = 2n, where x' is the arithmetic derivative of x.

Table of values

List of values

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

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

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