A063131 - cp's OEIS frontend

A063131 Odd composite numbers which in base 2 contain their largest proper factor as a substring of digits.

n	a(n)
1	55
2	91
3	215
4	407
5	493
6	893
7	1189
8	1343
9	1403
10	1643
11	1681
12	1961
13	3151
14	3223
15	3415
16	4063
17	4579
18	7087
19	7597
20	7979
21	8791
22	9167
23	10579
24	11227
25	13303
26	13655
27	14219
28	15487
29	16147
30	22939
31	23479
32	24341
33	25751
34	26101
35	27571
36	28757
37	30461
38	30607

[55, 91, 215, 407, 493, 893, 1189, 1343, 1403, 1643, 1681, 1961, 3151, 3223, 3415, 4063, 4579, 7087, 7597, 7979, 8791, 9167, 10579, 11227, 13303, 13655, 14219, 15487, 16147, 22939, 23479, 24341, 25751, 26101, 27571, 28757, 30461, 30607]

cp's OEIS Frontend

A063131 Odd composite numbers which in base 2 contain their largest proper factor as a substring of digits.

Table of values

List of values