A177904 - cp's OEIS frontend

A177904 a(1)=a(2)=a(3)=1; thereafter a(n) = gpf(a(n-1)+a(n-2)+a(n-3)), where gpf = "greatest prime factor".

n	a(n)
1	1
2	1
3	1
4	3
5	5
6	3
7	11
8	19
9	11
10	41
11	71
12	41
13	17
14	43
15	101
16	23
17	167
18	97
19	41
20	61
21	199
22	43
23	101
24	7
25	151
26	37
27	13
28	67
29	13
30	31
31	37
32	3
33	71
34	37
35	37
36	29
37	103
38	13
39	29
40	29
41	71
42	43
43	13
44	127
45	61
46	67
47	17
48	29
49	113
50	53
51	13
52	179
53	7
54	199
55	11
56	31
57	241
58	283
59	37
60	17
61	337
62	23
63	29
64	389
65	7
66	17
67	59
68	83
69	53
70	13
71	149
72	43
73	41
74	233
75	317
76	197
77	83
78	199
79	479
80	761
81	1439
82	47
83	107

[1, 1, 1, 3, 5, 3, 11, 19, 11, 41, 71, 41, 17, 43, 101, 23, 167, 97, 41, 61, 199, 43, 101, 7, 151, 37, 13, 67, 13, 31, 37, 3, 71, 37, 37, 29, 103, 13, 29, 29, 71, 43, 13, 127, 61, 67, 17, 29, 113, 53, 13, 179, 7, 199, 11, 31, 241, 283, 37, 17, 337, 23, 29, 389, 7, 17, 59, 83, 53, 13, 149, 43, 41, 233, 317, 197, 83, 199, 479, 761, 1439, 47, 107]

cp's OEIS Frontend

A177904 a(1)=a(2)=a(3)=1; thereafter a(n) = gpf(a(n-1)+a(n-2)+a(n-3)), where gpf = "greatest prime factor".

Table of values

List of values