A258101 - cp's OEIS frontend

A258101 Number x such that usigma(x) = (-1)sigma(x), where usigma(x) is the sum of unitary divisors of x (A034448) and (-1)sigma(x) is defined in A049060 .

n	a(n)
1	1
2	4
3	15867
4	21357
5	49887
6	63468
7	69875
8	85428
9	86387
10	149875
11	199548
12	247475
13	271607
14	279500
15	293944
16	318681
17	345548
18	599500
19	637659
20	989900
21	1086428
22	1169091
23	1274724
24	1897875
25	1913571
26	2550636
27	2665269
28	2801880
29	2855691

[1, 4, 15867, 21357, 49887, 63468, 69875, 85428, 86387, 149875, 199548, 247475, 271607, 279500, 293944, 318681, 345548, 599500, 637659, 989900, 1086428, 1169091, 1274724, 1897875, 1913571, 2550636, 2665269, 2801880, 2855691]

cp's OEIS Frontend

A258101 Number x such that usigma(x) = (-1)sigma(x), where usigma(x) is the sum of unitary divisors of x (A034448) and (-1)sigma(x) is defined in A049060 .

Table of values

List of values