A076560 - cp's OEIS frontend

A076560 a(1)=1; a(n>1)= greatest prime divisor of (a(n-1) + n).

n	a(n)
1	1
2	3
3	3
4	7
5	3
6	3
7	5
8	13
9	11
10	7
11	3
12	5
13	3
14	17
15	2
16	3
17	5
18	23
19	7
20	3
21	3
22	5
23	7
24	31
25	7
26	11
27	19
28	47
29	19
30	7
31	19
32	17
33	5
34	13
35	3
36	13
37	5
38	43
39	41
40	3
41	11
42	53
43	3
44	47
45	23
46	23
47	7
48	11
49	5
50	11
51	31
52	83
53	17
54	71
55	7
56	7
57	2
58	5
59	2
60	31
61	23
62	17
63	5
64	23
65	11
66	11
67	13
68	3
69	3
70	73
71	3
72	5
73	13
74	29
75	13
76	89
77	83
78	23
79	17
80	97
81	89
82	19

[1, 3, 3, 7, 3, 3, 5, 13, 11, 7, 3, 5, 3, 17, 2, 3, 5, 23, 7, 3, 3, 5, 7, 31, 7, 11, 19, 47, 19, 7, 19, 17, 5, 13, 3, 13, 5, 43, 41, 3, 11, 53, 3, 47, 23, 23, 7, 11, 5, 11, 31, 83, 17, 71, 7, 7, 2, 5, 2, 31, 23, 17, 5, 23, 11, 11, 13, 3, 3, 73, 3, 5, 13, 29, 13, 89, 83, 23, 17, 97, 89, 19]

cp's OEIS Frontend

A076560 a(1)=1; a(n>1)= greatest prime divisor of (a(n-1) + n).

Table of values

List of values

n	a(n)
1	1
2	3
3	3
4	7
5	3
6	3
7	5
8	13
9	11
10	7
11	3
12	5
13	3
14	17
15	2
16	3
17	5
18	23
19	7
20	3
21	3
22	5
23	7
24	31
25	7
26	11
27	19
28	47
29	19
30	7
31	19
32	17
33	5
34	13
35	3
36	13
37	5
38	43
39	41
40	3
41	11
42	53
43	3
44	47
45	23
46	23
47	7
48	11
49	5
50	11
51	31
52	83
53	17
54	71
55	7
56	7
57	2
58	5
59	2
60	31
61	23
62	17
63	5
64	23
65	11
66	11
67	13
68	3
69	3
70	73
71	3
72	5
73	13
74	29
75	13
76	89
77	83
78	23
79	17
80	97
81	89
82	19

n	a(n)
1	1
2	3
3	3
4	7
5	3
6	3
7	5
8	13
9	11
10	7
11	3
12	5
13	3
14	17
15	2
16	3
17	5
18	23
19	7
20	3
21	3
22	5
23	7
24	31
25	7
26	11
27	19
28	47
29	19
30	7
31	19
32	17
33	5
34	13
35	3
36	13
37	5
38	43
39	41
40	3
41	11
42	53
43	3
44	47
45	23
46	23
47	7
48	11
49	5
50	11
51	31
52	83
53	17
54	71
55	7
56	7
57	2
58	5
59	2
60	31
61	23
62	17
63	5
64	23
65	11
66	11
67	13
68	3
69	3
70	73
71	3
72	5
73	13
74	29
75	13
76	89
77	83
78	23
79	17
80	97
81	89
82	19

n	a(n)
1	1
2	3
3	3
4	7
5	3
6	3
7	5
8	13
9	11
10	7
11	3
12	5
13	3
14	17
15	2
16	3
17	5
18	23
19	7
20	3
21	3
22	5
23	7
24	31
25	7
26	11
27	19
28	47
29	19
30	7
31	19
32	17
33	5
34	13
35	3
36	13
37	5
38	43
39	41
40	3
41	11
42	53
43	3
44	47
45	23
46	23
47	7
48	11
49	5
50	11
51	31
52	83
53	17
54	71
55	7
56	7
57	2
58	5
59	2
60	31
61	23
62	17
63	5
64	23
65	11
66	11
67	13
68	3
69	3
70	73
71	3
72	5
73	13
74	29
75	13
76	89
77	83
78	23
79	17
80	97
81	89
82	19