A368680 - cp's OEIS frontend

A368680 Sum of the numbers k less than n and not dividing n such that n-k is squarefree.

n	a(n)
1	0
2	0
3	2
4	3
5	9
6	9
7	17
8	21
9	27
10	31
11	42
12	42
13	59
14	60
15	72
16	86
17	100
18	108
19	124
20	121
21	143
22	152
23	178
24	189
25	211
26	214
27	243
28	238
29	278
30	280
31	314
32	332
33	341
34	358
35	392
36	409
37	444
38	448
39	479
40	501
41	545
42	540
43	599
44	593
45	640
46	664
47	716
48	739
49	772
50	810
51	824
52	833
53	905
54	934
55	971
56	990
57	1020

[0, 0, 2, 3, 9, 9, 17, 21, 27, 31, 42, 42, 59, 60, 72, 86, 100, 108, 124, 121, 143, 152, 178, 189, 211, 214, 243, 238, 278, 280, 314, 332, 341, 358, 392, 409, 444, 448, 479, 501, 545, 540, 599, 593, 640, 664, 716, 739, 772, 810, 824, 833, 905, 934, 971, 990, 1020]

cp's OEIS Frontend

A368680 Sum of the numbers k less than n and not dividing n such that n-k is squarefree.

Table of values

List of values