A385904 - cp's OEIS frontend

A385904 a(n) is the number of nonempty subsets of the divisors of n that sum to a perfect square.

n	a(n)
1	1
2	1
3	2
4	2
5	1
6	4
7	1
8	3
9	3
10	2
11	1
12	11
13	1
14	3
15	4
16	5
17	1
18	9
19	1
20	9
21	3
22	3
23	1
24	27
25	2
26	2
27	4
28	8
29	1
30	27
31	1
32	7
33	3
34	2
35	2
36	49
37	1
38	1
39	3
40	22
41	1
42	21
43	1
44	7
45	8
46	3
47	1
48	77
49	2
50	5
51	2
52	4
53	1
54	22
55	2
56	21
57	2
58	1
59	1
60	248
61	1
62	2
63	7
64	11
65	1
66	21
67	1
68	4
69	2
70	17
71	1
72	235
73	1
74	1
75	9
76	7
77	1
78	20
79	1
80	64
81	6
82	1

[1, 1, 2, 2, 1, 4, 1, 3, 3, 2, 1, 11, 1, 3, 4, 5, 1, 9, 1, 9, 3, 3, 1, 27, 2, 2, 4, 8, 1, 27, 1, 7, 3, 2, 2, 49, 1, 1, 3, 22, 1, 21, 1, 7, 8, 3, 1, 77, 2, 5, 2, 4, 1, 22, 2, 21, 2, 1, 1, 248, 1, 2, 7, 11, 1, 21, 1, 4, 2, 17, 1, 235, 1, 1, 9, 7, 1, 20, 1, 64, 6, 1]

cp's OEIS Frontend

A385904 a(n) is the number of nonempty subsets of the divisors of n that sum to a perfect square.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	2
5	1
6	4
7	1
8	3
9	3
10	2
11	1
12	11
13	1
14	3
15	4
16	5
17	1
18	9
19	1
20	9
21	3
22	3
23	1
24	27
25	2
26	2
27	4
28	8
29	1
30	27
31	1
32	7
33	3
34	2
35	2
36	49
37	1
38	1
39	3
40	22
41	1
42	21
43	1
44	7
45	8
46	3
47	1
48	77
49	2
50	5
51	2
52	4
53	1
54	22
55	2
56	21
57	2
58	1
59	1
60	248
61	1
62	2
63	7
64	11
65	1
66	21
67	1
68	4
69	2
70	17
71	1
72	235
73	1
74	1
75	9
76	7
77	1
78	20
79	1
80	64
81	6
82	1

n	a(n)
1	1
2	1
3	2
4	2
5	1
6	4
7	1
8	3
9	3
10	2
11	1
12	11
13	1
14	3
15	4
16	5
17	1
18	9
19	1
20	9
21	3
22	3
23	1
24	27
25	2
26	2
27	4
28	8
29	1
30	27
31	1
32	7
33	3
34	2
35	2
36	49
37	1
38	1
39	3
40	22
41	1
42	21
43	1
44	7
45	8
46	3
47	1
48	77
49	2
50	5
51	2
52	4
53	1
54	22
55	2
56	21
57	2
58	1
59	1
60	248
61	1
62	2
63	7
64	11
65	1
66	21
67	1
68	4
69	2
70	17
71	1
72	235
73	1
74	1
75	9
76	7
77	1
78	20
79	1
80	64
81	6
82	1

n	a(n)
1	1
2	1
3	2
4	2
5	1
6	4
7	1
8	3
9	3
10	2
11	1
12	11
13	1
14	3
15	4
16	5
17	1
18	9
19	1
20	9
21	3
22	3
23	1
24	27
25	2
26	2
27	4
28	8
29	1
30	27
31	1
32	7
33	3
34	2
35	2
36	49
37	1
38	1
39	3
40	22
41	1
42	21
43	1
44	7
45	8
46	3
47	1
48	77
49	2
50	5
51	2
52	4
53	1
54	22
55	2
56	21
57	2
58	1
59	1
60	248
61	1
62	2
63	7
64	11
65	1
66	21
67	1
68	4
69	2
70	17
71	1
72	235
73	1
74	1
75	9
76	7
77	1
78	20
79	1
80	64
81	6
82	1