A383228 - cp's OEIS frontend

A383228 a(n) is the number of cases where both j and k (1 <= j < k <= n), are divisors of Sum_{i=j..k} i^i.

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

[0, 0, 0, 1, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 5, 5, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 10, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 14, 14, 14, 14, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17]

cp's OEIS Frontend

A383228 a(n) is the number of cases where both j and k (1 <= j < k <= n), are divisors of Sum_{i=j..k} i^i.

Table of values

List of values

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

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

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