A015617 - cp's OEIS frontend

A015617 Number of (unordered) triples of integers from [1,n] with no common factors between pairs.

n	a(n)
1	0
2	0
3	1
4	2
5	7
6	8
7	19
8	25
9	37
10	42
11	73
12	79
13	124
14	138
15	159
16	183
17	262
18	277
19	378
20	405
21	454
22	491
23	640
24	668
25	794
26	850
27	959
28	1016
29	1257
30	1285
31	1562
32	1668
33	1805
34	1905
35	2088
36	2150
37	2545
38	2673
39	2866
40	2968
41	3457
42	3522
43	4063
44	4228
45	4431
46	4620
47	5269
48	5385
49	5936

[0, 0, 1, 2, 7, 8, 19, 25, 37, 42, 73, 79, 124, 138, 159, 183, 262, 277, 378, 405, 454, 491, 640, 668, 794, 850, 959, 1016, 1257, 1285, 1562, 1668, 1805, 1905, 2088, 2150, 2545, 2673, 2866, 2968, 3457, 3522, 4063, 4228, 4431, 4620, 5269, 5385, 5936]

cp's OEIS Frontend

A015617 Number of (unordered) triples of integers from [1,n] with no common factors between pairs.

Table of values

List of values