A258843 - cp's OEIS frontend

A258843 Numbers k with the property that it is possible to write the base 2 expansion of k 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 sigma(a + b) = sigma(k).

n	a(n)
1	11
2	123
3	695
4	991
5	1919
6	2839
7	3707
8	3841
9	7615
10	8047
11	8055
12	9347
13	10703
14	12847
15	16195
16	26743
17	27089
18	32127
19	42251
20	56419
21	59027
22	59179
23	59389
24	59815
25	62749
26	65113
27	74671
28	115289
29	119211
30	122847
31	126895
32	129495
33	168739
34	191051
35	219295
36	224281
37	232315
38	233729

[11, 123, 695, 991, 1919, 2839, 3707, 3841, 7615, 8047, 8055, 9347, 10703, 12847, 16195, 26743, 27089, 32127, 42251, 56419, 59027, 59179, 59389, 59815, 62749, 65113, 74671, 115289, 119211, 122847, 126895, 129495, 168739, 191051, 219295, 224281, 232315, 233729]

cp's OEIS Frontend

A258843 Numbers k with the property that it is possible to write the base 2 expansion of k 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 sigma(a + b) = sigma(k).

Table of values

List of values