A230373 - cp's OEIS frontend

A230373 Numbers n such that sigma(sigma(n)) = sigma(sigma(n)), where sigma*(n) is the sum of anti-divisors of n (A066417).

n	a(n)
1	3
2	265
3	450
4	1989
5	18278
6	31639
7	55474
8	71306
9	96639
10	197518
11	267026
12	1620723
13	1888235
14	3605481
15	4448715
16	10837215
17	12128451
18	22598820
19	84681074
20	96503379
21	130118331
22	152234714
23	162138375
24	189149834
25	211239421
26	343379954
27	353833749
28	404994939
29	599244123
30	804486314

[3, 265, 450, 1989, 18278, 31639, 55474, 71306, 96639, 197518, 267026, 1620723, 1888235, 3605481, 4448715, 10837215, 12128451, 22598820, 84681074, 96503379, 130118331, 152234714, 162138375, 189149834, 211239421, 343379954, 353833749, 404994939, 599244123, 804486314]

cp's OEIS Frontend

A230373 Numbers n such that sigma(sigma(n)) = sigma(sigma(n)), where sigma*(n) is the sum of anti-divisors of n (A066417).

Table of values

List of values

cp's OEIS Frontend

A230373 Numbers n such that sigma(sigma*(n)) = sigma*(sigma(n)), where sigma*(n) is the sum of anti-divisors of n (A066417).

Table of values

List of values

A230373 Numbers n such that sigma(sigma(n)) = sigma(sigma(n)), where sigma*(n) is the sum of anti-divisors of n (A066417).