A357299 - cp's OEIS frontend

A357299 a(n) is the number of divisors of n whose first digit equals the first digit of n.

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

[1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3]

cp's OEIS Frontend

A357299 a(n) is the number of divisors of n whose first digit equals the first digit of n.

Table of values

List of values

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

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

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