A120358 - cp's OEIS frontend

A120358 Even refactorable numbers k such that the number r of odd divisors and the number s of even divisors are both odd divisors of k and k is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of k.

n	a(n)
1	2
2	18
3	72
4	450
5	1250
6	4050
7	16200
8	52488
9	56448
10	64800
11	71442
12	101250
13	198450
14	235298
15	285768
16	328050
17	405000
18	793800
19	1036800
20	1312200
21	1620000
22	1786050
23	3175200
24	4572288
25	4961250
26	5248800
27	7144200
28	12700800
29	14289858
30	15059072
31	16074450
32	19845000
33	24012450
34	25920000
35	28576800

[2, 18, 72, 450, 1250, 4050, 16200, 52488, 56448, 64800, 71442, 101250, 198450, 235298, 285768, 328050, 405000, 793800, 1036800, 1312200, 1620000, 1786050, 3175200, 4572288, 4961250, 5248800, 7144200, 12700800, 14289858, 15059072, 16074450, 19845000, 24012450, 25920000, 28576800]

cp's OEIS Frontend

A120358 Even refactorable numbers k such that the number r of odd divisors and the number s of even divisors are both odd divisors of k and k is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of k.

Table of values

List of values