A192439 - cp's OEIS frontend

A192439 a(n) = a(n-1) - a(n-2) if n is prime or a(n-1) + a(n-2) otherwise. a(1) = a(2) = 1.

n	a(n)
1	1
2	1
3	0
4	1
5	1
6	2
7	1
8	3
9	4
10	7
11	3
12	10
13	7
14	17
15	24
16	41
17	17
18	58
19	41
20	99
21	140
22	239
23	99
24	338
25	437
26	775
27	1212
28	1987
29	775
30	2762
31	1987
32	4749
33	6736
34	11485
35	18221
36	29706
37	11485
38	41191
39	52676
40	93867
41	41191
42	135058
43	93867
44	228925
45	322792
46	551717
47	228925
48	780642
49	1009567

[1, 1, 0, 1, 1, 2, 1, 3, 4, 7, 3, 10, 7, 17, 24, 41, 17, 58, 41, 99, 140, 239, 99, 338, 437, 775, 1212, 1987, 775, 2762, 1987, 4749, 6736, 11485, 18221, 29706, 11485, 41191, 52676, 93867, 41191, 135058, 93867, 228925, 322792, 551717, 228925, 780642, 1009567]

cp's OEIS Frontend

A192439 a(n) = a(n-1) - a(n-2) if n is prime or a(n-1) + a(n-2) otherwise. a(1) = a(2) = 1.

Table of values

List of values