A205139 - cp's OEIS frontend

A205139 The index j such that n divides s(k)-s(j), where k is the least index (A205138) for which such j exists, and s(k)=k*(3k-1)/2, the k-th pentagonal number.

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

[1, 1, 1, 1, 3, 2, 2, 5, 1, 3, 1, 4, 4, 4, 2, 5, 2, 1, 6, 3, 1, 7, 3, 4, 1, 9, 1, 2, 4, 2, 10, 21, 6, 1, 5, 1, 12, 14, 3, 3, 6, 8, 14, 4, 4, 2, 7, 4, 6, 1, 10, 7, 8, 2, 5, 2, 5, 3, 9, 12]

cp's OEIS Frontend

A205139 The index j such that n divides s(k)-s(j), where k is the least index (A205138) for which such j exists, and s(k)=k*(3k-1)/2, the k-th pentagonal number.

Table of values

List of values

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

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

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