A283486 - cp's OEIS frontend

A283486 Number of k such that sigma(k) = 2n where sigma(m) = A000203(m) is the sum of the divisors of m.

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

[0, 1, 1, 1, 0, 2, 1, 0, 2, 1, 0, 3, 0, 1, 1, 2, 0, 1, 1, 1, 3, 1, 0, 3, 0, 0, 2, 2, 0, 3, 1, 0, 0, 1, 0, 5, 1, 0, 1, 2, 0, 3, 0, 0, 3, 0, 0, 4, 2, 0, 1, 2, 0, 2, 1, 1, 2, 0, 0, 4, 0, 2, 2, 2, 0, 2, 0, 0, 1, 2, 0, 5, 0, 0, 1, 2, 0, 2, 1, 1, 1, 1, 0, 6, 0, 0, 1, 1, 0, 4, 2, 0, 2, 0, 0, 5]

cp's OEIS Frontend

A283486 Number of k such that sigma(k) = 2n where sigma(m) = A000203(m) is the sum of the divisors of m.

Table of values

List of values

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

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

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