A202276 - cp's OEIS frontend

A202276 Number of integers k <= n such that sigma(x) = k has no solution, sigma = A000203.

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	2
7	2
8	2
9	3
10	4
11	5
12	5
13	5
14	5
15	5
16	6
17	7
18	7
19	8
20	8
21	9
22	10
23	11
24	11
25	12
26	13
27	14
28	14
29	15
30	15
31	15
32	15
33	16
34	17
35	18
36	18
37	19
38	19
39	19
40	19
41	20
42	20
43	21
44	21
45	22
46	23
47	24
48	24
49	25
50	26
51	27
52	28
53	29
54	29
55	30
56	30
57	30
58	31
59	32
60	32
61	33
62	33
63	33
64	34
65	35
66	36
67	37
68	37
69	38
70	39

[0, 1, 1, 1, 2, 2, 2, 2, 3, 4, 5, 5, 5, 5, 5, 6, 7, 7, 8, 8, 9, 10, 11, 11, 12, 13, 14, 14, 15, 15, 15, 15, 16, 17, 18, 18, 19, 19, 19, 19, 20, 20, 21, 21, 22, 23, 24, 24, 25, 26, 27, 28, 29, 29, 30, 30, 30, 31, 32, 32, 33, 33, 33, 34, 35, 36, 37, 37, 38, 39]

cp's OEIS Frontend

A202276 Number of integers k <= n such that sigma(x) = k has no solution, sigma = A000203.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	2
7	2
8	2
9	3
10	4
11	5
12	5
13	5
14	5
15	5
16	6
17	7
18	7
19	8
20	8
21	9
22	10
23	11
24	11
25	12
26	13
27	14
28	14
29	15
30	15
31	15
32	15
33	16
34	17
35	18
36	18
37	19
38	19
39	19
40	19
41	20
42	20
43	21
44	21
45	22
46	23
47	24
48	24
49	25
50	26
51	27
52	28
53	29
54	29
55	30
56	30
57	30
58	31
59	32
60	32
61	33
62	33
63	33
64	34
65	35
66	36
67	37
68	37
69	38
70	39

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	2
7	2
8	2
9	3
10	4
11	5
12	5
13	5
14	5
15	5
16	6
17	7
18	7
19	8
20	8
21	9
22	10
23	11
24	11
25	12
26	13
27	14
28	14
29	15
30	15
31	15
32	15
33	16
34	17
35	18
36	18
37	19
38	19
39	19
40	19
41	20
42	20
43	21
44	21
45	22
46	23
47	24
48	24
49	25
50	26
51	27
52	28
53	29
54	29
55	30
56	30
57	30
58	31
59	32
60	32
61	33
62	33
63	33
64	34
65	35
66	36
67	37
68	37
69	38
70	39

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	2
7	2
8	2
9	3
10	4
11	5
12	5
13	5
14	5
15	5
16	6
17	7
18	7
19	8
20	8
21	9
22	10
23	11
24	11
25	12
26	13
27	14
28	14
29	15
30	15
31	15
32	15
33	16
34	17
35	18
36	18
37	19
38	19
39	19
40	19
41	20
42	20
43	21
44	21
45	22
46	23
47	24
48	24
49	25
50	26
51	27
52	28
53	29
54	29
55	30
56	30
57	30
58	31
59	32
60	32
61	33
62	33
63	33
64	34
65	35
66	36
67	37
68	37
69	38
70	39