A254032 - cp's OEIS frontend

A254032 a(0)=0, a(1)=1; for n > 2, a(n) is the smallest prime factor of a(n-1) + a(n-2) not already in the sequence or, if there is no such prime, a(n) = 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	49
18	79
19	128
20	23
21	151
22	29
23	180
24	209
25	389
26	598
27	987
28	317
29	163
30	480
31	643
32	1123
33	883
34	17
35	900
36	131
37	1031
38	83
39	557
40	640
41	1197
42	167
43	31
44	198
45	229
46	61
47	290
48	351
49	641
50	992
51	71
52	1063
53	1134
54	2197
55	3331
56	691

[0, 1, 1, 2, 3, 5, 8, 13, 7, 20, 27, 47, 37, 84, 11, 19, 30, 49, 79, 128, 23, 151, 29, 180, 209, 389, 598, 987, 317, 163, 480, 643, 1123, 883, 17, 900, 131, 1031, 83, 557, 640, 1197, 167, 31, 198, 229, 61, 290, 351, 641, 992, 71, 1063, 1134, 2197, 3331, 691]

cp's OEIS Frontend

A254032 a(0)=0, a(1)=1; for n > 2, a(n) is the smallest prime factor of a(n-1) + a(n-2) not already in the sequence or, if there is no such prime, a(n) = a(n-1) + a(n-2).

Table of values

List of values