The first 15 numbers in base 2, alongside their decimal equivalents, are:
1: 1
2: 10
3: 11
4: 100
5: 101
6: 110
7: 111
8: 1000
9: 1001
10: 1010
11: 1011
12: 1100
13: 1101
14: 1110
15: 1111
Keep in mind that in other bases other than base 10, the numbers are spelled out in digits, for example, 1101 is pronounced "one one oh one" rather than "one thousand one hundred and one".
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They are 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15 and 16.
1,2,3,4,5,6,7,8,10,11,12,13,14,15,16
1, 2, 10, 11, 12, 20, 21, 22, 100, 101.
In base 3, the counting numbers are represented using the digits 0, 1, and 2. The first 15 counting numbers in base 3 are: 0, 1, 2, 10, 11, 12, 20, 21, 22, 100, 101, 102, 110, 111, and 112. Each place value increases by powers of 3, similar to how place values increase by powers of 10 in the decimal system.
1,10,11,100,101,110,111,1000,1001,1010,1011,1100,1101,1110,1111