A338509 - cp's OEIS frontend

A338509 a(n) is the number of ordered triples of divisors d_i < d_j < d_k of m such that GCD(d_i, d_j, d_k) > 1 where m is the least number having its prime signature; m = A025487(n).

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	5
7	4
8	23
9	12
10	10
11	36
12	62
13	87
14	20
15	120
16	130
17	289
18	35
19	284
20	432
21	235
22	200
23	356
24	682
25	56
26	555
27	1256
28	385
29	1005
30	795
31	1330
32	84
33	960
34	2775
35	588
36	2939
37	1501
38	1844
39	2297
40	120
41	3436
42	1526
43	4304
44	1720
45	5205
46	852
47	6514
48	2538
49	5001
50	3647
51	165
52	7341
53	2280
54	2280
55	11712

[0, 0, 0, 0, 1, 5, 4, 23, 12, 10, 36, 62, 87, 20, 120, 130, 289, 35, 284, 432, 235, 200, 356, 682, 56, 555, 1256, 385, 1005, 795, 1330, 84, 960, 2775, 588, 2939, 1501, 1844, 2297, 120, 3436, 1526, 4304, 1720, 5205, 852, 6514, 2538, 5001, 3647, 165, 7341, 2280, 2280, 11712]

cp's OEIS Frontend

A338509 a(n) is the number of ordered triples of divisors d_i < d_j < d_k of m such that GCD(d_i, d_j, d_k) > 1 where m is the least number having its prime signature; m = A025487(n).

Table of values

List of values