A259397 - cp's OEIS frontend

A259397 Numbers n with the property that it is possible to write the base 2 expansion of n as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have phi(a + b) = phi(n), where phi(n) is the Euler totient function of n.

n	a(n)
1	6
2	12
3	14
4	28
5	30
6	48
7	62
8	124
9	126
10	222
11	224
12	254
13	448
14	476
15	496
16	510
17	768
18	876
19	1022
20	1792
21	1806
22	2032
23	2034
24	2046
25	2625
26	2850
27	2898
28	3204
29	3246
30	3560
31	3705
32	3850
33	4064
34	4094
35	7722
36	7744
37	7920
38	7980
39	7992
40	8060
41	8094
42	8136
43	8148
44	8150
45	8164
46	8190
47	11880
48	13365

[6, 12, 14, 28, 30, 48, 62, 124, 126, 222, 224, 254, 448, 476, 496, 510, 768, 876, 1022, 1792, 1806, 2032, 2034, 2046, 2625, 2850, 2898, 3204, 3246, 3560, 3705, 3850, 4064, 4094, 7722, 7744, 7920, 7980, 7992, 8060, 8094, 8136, 8148, 8150, 8164, 8190, 11880, 13365]

cp's OEIS Frontend

A259397 Numbers n with the property that it is possible to write the base 2 expansion of n as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have phi(a + b) = phi(n), where phi(n) is the Euler totient function of n.

Table of values

List of values