A331409 - cp's OEIS frontend

A331409 a(1)=1; for n>1, a(n) = a(n-1)+n, divided by its largest prime factor.

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

[1, 1, 2, 2, 1, 1, 4, 4, 1, 1, 4, 8, 3, 1, 8, 8, 5, 1, 4, 8, 1, 1, 8, 16, 1, 9, 12, 8, 1, 1, 16, 16, 7, 1, 12, 16, 1, 3, 6, 2, 1, 1, 4, 16, 1, 1, 16, 32, 27, 7, 2, 18, 1, 5, 12, 4, 1, 1, 12, 24, 5, 1, 32, 32, 1, 1, 4, 24, 3, 1, 24, 32, 15, 1, 4, 16, 3, 27, 2, 2, 1, 1, 12, 32, 9]

cp's OEIS Frontend

A331409 a(1)=1; for n>1, a(n) = a(n-1)+n, divided by its largest prime factor.

Table of values

List of values

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

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

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