A368825 - cp's OEIS frontend

A368825 a(1) = 1; for n > 1, a(n) = A055231(a(n-1) + n), where A055231(k) is the powerfree part of k.

n	a(n)
1	1
2	3
3	6
4	10
5	15
6	21
7	7
8	15
9	3
10	13
11	3
12	15
13	7
14	21
15	1
16	17
17	34
18	13
19	1
20	21
21	42
22	1
23	3
24	1
25	26
26	13
27	5
28	33
29	62
30	23
31	2
32	34
33	67
34	101
35	17
36	53
37	10
38	3
39	42
40	82
41	123
42	165
43	13
44	57
45	102
46	37
47	21
48	69
49	118
50	21
51	1
52	53
53	106
54	5
55	15
56	71
57	1
58	59
59	118
60	178
61	239
62	301
63	91
64	155
65	55
66	1
67	17
68	85
69	154
70	7
71	78
72	6
73	79
74	17
75	23
76	11

[1, 3, 6, 10, 15, 21, 7, 15, 3, 13, 3, 15, 7, 21, 1, 17, 34, 13, 1, 21, 42, 1, 3, 1, 26, 13, 5, 33, 62, 23, 2, 34, 67, 101, 17, 53, 10, 3, 42, 82, 123, 165, 13, 57, 102, 37, 21, 69, 118, 21, 1, 53, 106, 5, 15, 71, 1, 59, 118, 178, 239, 301, 91, 155, 55, 1, 17, 85, 154, 7, 78, 6, 79, 17, 23, 11]

cp's OEIS Frontend

A368825 a(1) = 1; for n > 1, a(n) = A055231(a(n-1) + n), where A055231(k) is the powerfree part of k.

Table of values

List of values

n	a(n)
1	1
2	3
3	6
4	10
5	15
6	21
7	7
8	15
9	3
10	13
11	3
12	15
13	7
14	21
15	1
16	17
17	34
18	13
19	1
20	21
21	42
22	1
23	3
24	1
25	26
26	13
27	5
28	33
29	62
30	23
31	2
32	34
33	67
34	101
35	17
36	53
37	10
38	3
39	42
40	82
41	123
42	165
43	13
44	57
45	102
46	37
47	21
48	69
49	118
50	21
51	1
52	53
53	106
54	5
55	15
56	71
57	1
58	59
59	118
60	178
61	239
62	301
63	91
64	155
65	55
66	1
67	17
68	85
69	154
70	7
71	78
72	6
73	79
74	17
75	23
76	11

n	a(n)
1	1
2	3
3	6
4	10
5	15
6	21
7	7
8	15
9	3
10	13
11	3
12	15
13	7
14	21
15	1
16	17
17	34
18	13
19	1
20	21
21	42
22	1
23	3
24	1
25	26
26	13
27	5
28	33
29	62
30	23
31	2
32	34
33	67
34	101
35	17
36	53
37	10
38	3
39	42
40	82
41	123
42	165
43	13
44	57
45	102
46	37
47	21
48	69
49	118
50	21
51	1
52	53
53	106
54	5
55	15
56	71
57	1
58	59
59	118
60	178
61	239
62	301
63	91
64	155
65	55
66	1
67	17
68	85
69	154
70	7
71	78
72	6
73	79
74	17
75	23
76	11

n	a(n)
1	1
2	3
3	6
4	10
5	15
6	21
7	7
8	15
9	3
10	13
11	3
12	15
13	7
14	21
15	1
16	17
17	34
18	13
19	1
20	21
21	42
22	1
23	3
24	1
25	26
26	13
27	5
28	33
29	62
30	23
31	2
32	34
33	67
34	101
35	17
36	53
37	10
38	3
39	42
40	82
41	123
42	165
43	13
44	57
45	102
46	37
47	21
48	69
49	118
50	21
51	1
52	53
53	106
54	5
55	15
56	71
57	1
58	59
59	118
60	178
61	239
62	301
63	91
64	155
65	55
66	1
67	17
68	85
69	154
70	7
71	78
72	6
73	79
74	17
75	23
76	11