A067230 - cp's OEIS frontend

A067230 Numbers n such that phi(2n-1) = sigma(n).

n	a(n)
1	1
2	3
3	5
4	10
5	11
6	23
7	33
8	46
9	65
10	77
11	123
12	136
13	221
14	371
15	383
16	423
17	483
18	513
19	545
20	670
21	753
22	1643
23	2033
24	3838
25	3885
26	4533
27	4798
28	5177
29	7463
30	7739
31	8201
32	8985
33	9010
34	9393
35	12256
36	13144
37	14104
38	17110
39	17147
40	17663
41	18695
42	19817
43	21119
44	23038
45	24695

[1, 3, 5, 10, 11, 23, 33, 46, 65, 77, 123, 136, 221, 371, 383, 423, 483, 513, 545, 670, 753, 1643, 2033, 3838, 3885, 4533, 4798, 5177, 7463, 7739, 8201, 8985, 9010, 9393, 12256, 13144, 14104, 17110, 17147, 17663, 18695, 19817, 21119, 23038, 24695]

cp's OEIS Frontend

A067230 Numbers n such that phi(2n-1) = sigma(n).

Table of values

List of values