A361672 - cp's OEIS frontend

A361672 a(1) = a(2) = 1; for n > 2, a(n) = a(n-2) + a(n-1) + n if a(n-1) and n are coprime, otherwise a(n) = a(n-1)/gcd(a(n-1), n).

n	a(n)
1	1
2	1
3	5
4	10
5	2
6	1
7	10
8	5
9	24
10	12
11	47
12	71
13	131
14	216
15	72
16	9
17	98
18	49
19	166
20	83
21	270
22	135
23	428
24	107
25	560
26	280
27	867
28	1175
29	2071
30	3276
31	5378
32	2689
33	8100
34	4050
35	810
36	45
37	892
38	446
39	1377
40	1863
41	3281
42	5186
43	8510
44	4255
45	851
46	37
47	935
48	1020
49	2004
50	1002
51	334
52	167
53	554
54	277
55	886

[1, 1, 5, 10, 2, 1, 10, 5, 24, 12, 47, 71, 131, 216, 72, 9, 98, 49, 166, 83, 270, 135, 428, 107, 560, 280, 867, 1175, 2071, 3276, 5378, 2689, 8100, 4050, 810, 45, 892, 446, 1377, 1863, 3281, 5186, 8510, 4255, 851, 37, 935, 1020, 2004, 1002, 334, 167, 554, 277, 886]

cp's OEIS Frontend

A361672 a(1) = a(2) = 1; for n > 2, a(n) = a(n-2) + a(n-1) + n if a(n-1) and n are coprime, otherwise a(n) = a(n-1)/gcd(a(n-1), n).

Table of values

List of values