A254624 - cp's OEIS frontend

A254624 Numbers x such that x = concatenate(a, b) and phi(a) + phi(b) = sigma(x) - x.

n	a(n)
1	49
2	169
3	289
4	611
5	1751
6	2171
7	2231
8	7921
9	10751
10	11479
11	23153
12	24367
13	38551
14	38809
15	49901
16	99101
17	116303
18	143351
19	229441
20	268151
21	271441
22	306181
23	357101
24	1030301
25	2014751
26	2078663

[49, 169, 289, 611, 1751, 2171, 2231, 7921, 10751, 11479, 23153, 24367, 38551, 38809, 49901, 99101, 116303, 143351, 229441, 268151, 271441, 306181, 357101, 1030301, 2014751, 2078663]

cp's OEIS Frontend

A254624 Numbers x such that x = concatenate(a, b) and phi(a) + phi(b) = sigma(x) - x.

Table of values

List of values