A214320 - cp's OEIS frontend

A214320 a(0)=a(1)=a(2)=1; thereafter a(n) = gpf(a(n-1)+a(n-3)), where gpf = "greatest prime factor".

n	a(n)
0	1
1	1
2	1
3	2
4	3
5	2
6	2
7	5
8	7
9	3
10	2
11	3
12	3
13	5
14	2
15	5
16	5
17	7
18	3
19	2
20	3
21	3
22	5
23	2
24	5
25	5
26	7
27	3
28	2
29	3
30	3
31	5
32	2
33	5
34	5
35	7
36	3
37	2
38	3
39	3
40	5
41	2
42	5
43	5
44	7
45	3
46	2
47	3
48	3
49	5
50	2
51	5
52	5
53	7
54	3
55	2
56	3
57	3
58	5
59	2
60	5
61	5
62	7
63	3
64	2
65	3
66	3
67	5
68	2
69	5
70	5
71	7
72	3
73	2
74	3
75	3
76	5
77	2
78	5
79	5
80	7
81	3
82	2
83	3
84	3
85	5
86	2
87	5
88	5
89	7
90	3
91	2
92	3
93	3
94	5
95	2
96	5
97	5
98	7
99	3
100	2
101	3
102	3
103	5
104	2
105	5
106	5
107	7
108	3
109	2
110	3
111	3
112	5
113	2
114	5
115	5
116	7
117	3
118	2
119	3
120	3

[1, 1, 1, 2, 3, 2, 2, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3, 5, 2, 5, 5, 7, 3, 2, 3, 3]

cp's OEIS Frontend

A214320 a(0)=a(1)=a(2)=1; thereafter a(n) = gpf(a(n-1)+a(n-3)), where gpf = "greatest prime factor".

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	2
4	3
5	2
6	2
7	5
8	7
9	3
10	2
11	3
12	3
13	5
14	2
15	5
16	5
17	7
18	3
19	2
20	3
21	3
22	5
23	2
24	5
25	5
26	7
27	3
28	2
29	3
30	3
31	5
32	2
33	5
34	5
35	7
36	3
37	2
38	3
39	3
40	5
41	2
42	5
43	5
44	7
45	3
46	2
47	3
48	3
49	5
50	2
51	5
52	5
53	7
54	3
55	2
56	3
57	3
58	5
59	2
60	5
61	5
62	7
63	3
64	2
65	3
66	3
67	5
68	2
69	5
70	5
71	7
72	3
73	2
74	3
75	3
76	5
77	2
78	5
79	5
80	7
81	3
82	2
83	3
84	3
85	5
86	2
87	5
88	5
89	7
90	3
91	2
92	3
93	3
94	5
95	2
96	5
97	5
98	7
99	3
100	2
101	3
102	3
103	5
104	2
105	5
106	5
107	7
108	3
109	2
110	3
111	3
112	5
113	2
114	5
115	5
116	7
117	3
118	2
119	3
120	3

n	a(n)
0	1
1	1
2	1
3	2
4	3
5	2
6	2
7	5
8	7
9	3
10	2
11	3
12	3
13	5
14	2
15	5
16	5
17	7
18	3
19	2
20	3
21	3
22	5
23	2
24	5
25	5
26	7
27	3
28	2
29	3
30	3
31	5
32	2
33	5
34	5
35	7
36	3
37	2
38	3
39	3
40	5
41	2
42	5
43	5
44	7
45	3
46	2
47	3
48	3
49	5
50	2
51	5
52	5
53	7
54	3
55	2
56	3
57	3
58	5
59	2
60	5
61	5
62	7
63	3
64	2
65	3
66	3
67	5
68	2
69	5
70	5
71	7
72	3
73	2
74	3
75	3
76	5
77	2
78	5
79	5
80	7
81	3
82	2
83	3
84	3
85	5
86	2
87	5
88	5
89	7
90	3
91	2
92	3
93	3
94	5
95	2
96	5
97	5
98	7
99	3
100	2
101	3
102	3
103	5
104	2
105	5
106	5
107	7
108	3
109	2
110	3
111	3
112	5
113	2
114	5
115	5
116	7
117	3
118	2
119	3
120	3

n	a(n)
0	1
1	1
2	1
3	2
4	3
5	2
6	2
7	5
8	7
9	3
10	2
11	3
12	3
13	5
14	2
15	5
16	5
17	7
18	3
19	2
20	3
21	3
22	5
23	2
24	5
25	5
26	7
27	3
28	2
29	3
30	3
31	5
32	2
33	5
34	5
35	7
36	3
37	2
38	3
39	3
40	5
41	2
42	5
43	5
44	7
45	3
46	2
47	3
48	3
49	5
50	2
51	5
52	5
53	7
54	3
55	2
56	3
57	3
58	5
59	2
60	5
61	5
62	7
63	3
64	2
65	3
66	3
67	5
68	2
69	5
70	5
71	7
72	3
73	2
74	3
75	3
76	5
77	2
78	5
79	5
80	7
81	3
82	2
83	3
84	3
85	5
86	2
87	5
88	5
89	7
90	3
91	2
92	3
93	3
94	5
95	2
96	5
97	5
98	7
99	3
100	2
101	3
102	3
103	5
104	2
105	5
106	5
107	7
108	3
109	2
110	3
111	3
112	5
113	2
114	5
115	5
116	7
117	3
118	2
119	3
120	3