A214094 - cp's OEIS frontend

A214094 a(0)=0, a(1)=1; a(n)=a(n-1)+a(n-2) if a(n-1)+a(n-2) is not semiprime; otherwise a(n) is the largest prime divisor of a(n-1)+a(n-2).

n	a(n)
0	0
1	1
2	1
3	2
4	3
5	5
6	8
7	13
8	7
9	20
10	27
11	47
12	37
13	84
14	11
15	19
16	30
17	7
18	37
19	44
20	81
21	125
22	103
23	228
24	331
25	43
26	374
27	139
28	513
29	652
30	233
31	885
32	1118
33	2003
34	3121
35	5124
36	8245
37	461
38	8706
39	103
40	383
41	486
42	79
43	113
44	192
45	61
46	23
47	84
48	107
49	191
50	149
51	340
52	163
53	503
54	666
55	167
56	833
57	1000
58	1833
59	2833
60	2333
61	5166
62	7499

[0, 1, 1, 2, 3, 5, 8, 13, 7, 20, 27, 47, 37, 84, 11, 19, 30, 7, 37, 44, 81, 125, 103, 228, 331, 43, 374, 139, 513, 652, 233, 885, 1118, 2003, 3121, 5124, 8245, 461, 8706, 103, 383, 486, 79, 113, 192, 61, 23, 84, 107, 191, 149, 340, 163, 503, 666, 167, 833, 1000, 1833, 2833, 2333, 5166, 7499]

cp's OEIS Frontend

A214094 a(0)=0, a(1)=1; a(n)=a(n-1)+a(n-2) if a(n-1)+a(n-2) is not semiprime; otherwise a(n) is the largest prime divisor of a(n-1)+a(n-2).

Table of values

List of values