A092587 - cp's OEIS frontend

A092587 Numbers k such that sigma(phi(k))-phi(sigma(k)) is nonzero and divisible by phi(k), that is A065395(k)/A000010(k) is a nonzero integer.

n	a(n)
1	2
2	18
3	21
4	99
5	133
6	151
7	175
8	183
9	350
10	366
11	449
12	450
13	477
14	532
15	581
16	645
17	702
18	843
19	1072
20	1253
21	1346
22	1508
23	1645
24	1833
25	2085
26	2097
27	2150
28	2421
29	3668
30	3950
31	4223
32	4312
33	4453
34	5264
35	6601
36	6853
37	7128
38	7423
39	7622
40	7713
41	8325
42	9028
43	9364
44	9707
45	10820

[2, 18, 21, 99, 133, 151, 175, 183, 350, 366, 449, 450, 477, 532, 581, 645, 702, 843, 1072, 1253, 1346, 1508, 1645, 1833, 2085, 2097, 2150, 2421, 3668, 3950, 4223, 4312, 4453, 5264, 6601, 6853, 7128, 7423, 7622, 7713, 8325, 9028, 9364, 9707, 10820]

cp's OEIS Frontend

A092587 Numbers k such that sigma(phi(k))-phi(sigma(k)) is nonzero and divisible by phi(k), that is A065395(k)/A000010(k) is a nonzero integer.

Table of values

List of values