A033618 - cp's OEIS frontend

A033618 Number of ways n-th repdigit number, A010785(n), can be expressed as a polygonal number.

n	a(n)
2	2
3	2
4	2
5	2
6	3
7	2
8	2
9	3
10	2
11	3
12	3
13	2
14	4
15	5
16	2
17	3
18	3
19	4
20	3
21	4
22	3
23	4
24	5
25	3
26	3
27	3
28	3
29	2
30	3
31	3
32	3
33	6
34	3
35	2
36	3
37	2
38	3
39	3
40	3
41	3
42	4
43	2
44	3
45	3
46	7
47	3
48	4
49	3
50	4
51	5
52	4
53	3
54	4
55	2
56	2
57	3
58	3
59	3
60	4
61	3
62	3
63	3
64	3
65	4
66	3
67	2
68	3
69	6
70	2
71	3
72	3

[2, 2, 2, 2, 3, 2, 2, 3, 2, 3, 3, 2, 4, 5, 2, 3, 3, 4, 3, 4, 3, 4, 5, 3, 3, 3, 3, 2, 3, 3, 3, 6, 3, 2, 3, 2, 3, 3, 3, 3, 4, 2, 3, 3, 7, 3, 4, 3, 4, 5, 4, 3, 4, 2, 2, 3, 3, 3, 4, 3, 3, 3, 3, 4, 3, 2, 3, 6, 2, 3, 3]

cp's OEIS Frontend

A033618 Number of ways n-th repdigit number, A010785(n), can be expressed as a polygonal number.

Table of values

List of values

n	a(n)
2	2
3	2
4	2
5	2
6	3
7	2
8	2
9	3
10	2
11	3
12	3
13	2
14	4
15	5
16	2
17	3
18	3
19	4
20	3
21	4
22	3
23	4
24	5
25	3
26	3
27	3
28	3
29	2
30	3
31	3
32	3
33	6
34	3
35	2
36	3
37	2
38	3
39	3
40	3
41	3
42	4
43	2
44	3
45	3
46	7
47	3
48	4
49	3
50	4
51	5
52	4
53	3
54	4
55	2
56	2
57	3
58	3
59	3
60	4
61	3
62	3
63	3
64	3
65	4
66	3
67	2
68	3
69	6
70	2
71	3
72	3

n	a(n)
2	2
3	2
4	2
5	2
6	3
7	2
8	2
9	3
10	2
11	3
12	3
13	2
14	4
15	5
16	2
17	3
18	3
19	4
20	3
21	4
22	3
23	4
24	5
25	3
26	3
27	3
28	3
29	2
30	3
31	3
32	3
33	6
34	3
35	2
36	3
37	2
38	3
39	3
40	3
41	3
42	4
43	2
44	3
45	3
46	7
47	3
48	4
49	3
50	4
51	5
52	4
53	3
54	4
55	2
56	2
57	3
58	3
59	3
60	4
61	3
62	3
63	3
64	3
65	4
66	3
67	2
68	3
69	6
70	2
71	3
72	3

n	a(n)
2	2
3	2
4	2
5	2
6	3
7	2
8	2
9	3
10	2
11	3
12	3
13	2
14	4
15	5
16	2
17	3
18	3
19	4
20	3
21	4
22	3
23	4
24	5
25	3
26	3
27	3
28	3
29	2
30	3
31	3
32	3
33	6
34	3
35	2
36	3
37	2
38	3
39	3
40	3
41	3
42	4
43	2
44	3
45	3
46	7
47	3
48	4
49	3
50	4
51	5
52	4
53	3
54	4
55	2
56	2
57	3
58	3
59	3
60	4
61	3
62	3
63	3
64	3
65	4
66	3
67	2
68	3
69	6
70	2
71	3
72	3