A328174 - cp's OEIS frontend

A328174 a(n) is the least integer k such that sigma(k)/(d(k)*sopf(k)) = n where d=A000005, sigma=A000203 and sopf=A008472.

n	a(n)
1	20
2	140
3	54
4	189
5	378
6	1365
7	540
8	945
9	1120
10	1755
11	1539
12	3465
13	500
14	1815
15	4256
16	6384
17	14645
18	5280
19	1323
20	1029
21	864
22	23871
23	34579
24	12903
25	1715
26	2673
27	11934
28	5589
29	106805
30	12285
31	5600
32	11625
33	21070
34	41915
35	4459
36	16905
37	61320
38	6615
39	11178
40	5145
41	110839
42	19656
43	109225

[20, 140, 54, 189, 378, 1365, 540, 945, 1120, 1755, 1539, 3465, 500, 1815, 4256, 6384, 14645, 5280, 1323, 1029, 864, 23871, 34579, 12903, 1715, 2673, 11934, 5589, 106805, 12285, 5600, 11625, 21070, 41915, 4459, 16905, 61320, 6615, 11178, 5145, 110839, 19656, 109225]

cp's OEIS Frontend

A328174 a(n) is the least integer k such that sigma(k)/(d(k)*sopf(k)) = n where d=A000005, sigma=A000203 and sopf=A008472.

Table of values

List of values