A309870 - cp's OEIS frontend

A309870 a(n) is the smallest number whose digits are 1's and 0's that cannot be written as a concatenation of any of the previous terms (not repeating any terms in the concatenation). a(0) = 0.

n	a(n)
0	0
1	1
2	11
3	100
4	101
5	1111
6	10000
7	11001
8	11011
9	100010
10	100100
11	101000
12	101001
13	101010
14	101101
15	110001
16	1000000
17	1000110
18	1001100
19	1010110
20	1100001
21	1110011
22	1110111
23	10000010
24	10001000
25	10001110
26	10010100
27	10011100
28	10100000
29	10101110
30	10111010

[0, 1, 11, 100, 101, 1111, 10000, 11001, 11011, 100010, 100100, 101000, 101001, 101010, 101101, 110001, 1000000, 1000110, 1001100, 1010110, 1100001, 1110011, 1110111, 10000010, 10001000, 10001110, 10010100, 10011100, 10100000, 10101110, 10111010]

cp's OEIS Frontend

A309870 a(n) is the smallest number whose digits are 1's and 0's that cannot be written as a concatenation of any of the previous terms (not repeating any terms in the concatenation). a(0) = 0.

Table of values

List of values