A082057 - cp's OEIS frontend

A082057 Least x=a(n) such that product of common prime-divisors [without multiplicity] of sigma(x) and phi(x) equals n; or 0 if n is not a squarefree number or if no such x exists. Among indices n only squarefree numbers arise because multiplicity of prime factors is ignored.

n	a(n)
1	1
2	3
3	18
4	0
5	200
6	14
7	3364
8	0
9	0
10	88
11	9801
12	0
13	25281
14	116
15	1800
16	0
17	36992
18	0
19	4414201
20	0
21	196
22	2881
23	541696
24	0
25	0
26	711
27	0
28	0
29	98942809
30	209
31	1547536
32	0
33	19602
34	6901
35	814088
36	0
37	49042009
38	8473
39	1521
40	0
41	3150464641
42	377
43	245178368
44	0
45	0
46	6439
47	9265217536
48	0
49	0

[1, 3, 18, 0, 200, 14, 3364, 0, 0, 88, 9801, 0, 25281, 116, 1800, 0, 36992, 0, 4414201, 0, 196, 2881, 541696, 0, 0, 711, 0, 0, 98942809, 209, 1547536, 0, 19602, 6901, 814088, 0, 49042009, 8473, 1521, 0, 3150464641, 377, 245178368, 0, 0, 6439, 9265217536, 0, 0]

cp's OEIS Frontend

A082057 Least x=a(n) such that product of common prime-divisors [without multiplicity] of sigma(x) and phi(x) equals n; or 0 if n is not a squarefree number or if no such x exists. Among indices n only squarefree numbers arise because multiplicity of prime factors is ignored.

Table of values

List of values