A121368 - cp's OEIS frontend

A121368 a(1) = a(2) = 1, a(n) = A007947(a(n-1)) + a(n-2), for n >= 3, i.e., a(n) = a(n-2) plus the largest squarefree divisor of a(n-1).

n	a(n)
1	1
2	1
3	2
4	3
5	5
6	8
7	7
8	15
9	22
10	37
11	59
12	96
13	65
14	161
15	226
16	387
17	355
18	742
19	1097
20	1839
21	2936
22	2573
23	5509
24	8082
25	8203
26	16285
27	24488
28	22407
29	46895
30	69302
31	116197
32	185499
33	178030
34	363529
35	541559
36	905088
37	555701
38	1460789
39	591330
40	2052119
41	2643449
42	4695568

[1, 1, 2, 3, 5, 8, 7, 15, 22, 37, 59, 96, 65, 161, 226, 387, 355, 742, 1097, 1839, 2936, 2573, 5509, 8082, 8203, 16285, 24488, 22407, 46895, 69302, 116197, 185499, 178030, 363529, 541559, 905088, 555701, 1460789, 591330, 2052119, 2643449, 4695568]

cp's OEIS Frontend

A121368 a(1) = a(2) = 1, a(n) = A007947(a(n-1)) + a(n-2), for n >= 3, i.e., a(n) = a(n-2) plus the largest squarefree divisor of a(n-1).

Table of values

List of values