A174568 - cp's OEIS frontend

A174568 Numbers n such that phi(n) + sigma(n) = sigma(n + phi(n)).

n	a(n)
1	2
2	3
3	7
4	19
5	31
6	37
7	79
8	97
9	99
10	135
11	139
12	157
13	198
14	199
15	211
16	229
17	271
18	287
19	307
20	331
21	337
22	350
23	367
24	379
25	439
26	499
27	539
28	547
29	577
30	601
31	607
32	619
33	661
34	671
35	691
36	727
37	811
38	829
39	877
40	923
41	937
42	967
43	997
44	1009
45	1069
46	1171
47	1237
48	1254
49	1279
50	1297
51	1399
52	1429

[2, 3, 7, 19, 31, 37, 79, 97, 99, 135, 139, 157, 198, 199, 211, 229, 271, 287, 307, 331, 337, 350, 367, 379, 439, 499, 539, 547, 577, 601, 607, 619, 661, 671, 691, 727, 811, 829, 877, 923, 937, 967, 997, 1009, 1069, 1171, 1237, 1254, 1279, 1297, 1399, 1429]

cp's OEIS Frontend

A174568 Numbers n such that phi(n) + sigma(n) = sigma(n + phi(n)).

Table of values

List of values