Question

List the first twenty counting numbers in base seven? (only digits 0 thru 6 are used in base 7)

Answer 1

So the question ask to list the first twenty counting numbers in base seven and the best answer would be 1, 2, 3, 4, 5, 6, 10, 11, 12, 13, 14, 15, 16 , 20 ,21, 22, 23, 24, 25, 26, 30, 31, 32, 33, 34, 35, 36, 40, 41. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification about the said question 

Answer 2

The correct answer is:

1, 2, 3, 4, 5, 6, 10, 11, 12, 13, 14, 15, 16, 20, 21, 22, 23, 24, 25, 26.

Explanation:

The base 7 number system has digits 0 through 6.

When we start counting, we start with 1. In base 7, we would be able to go from 1 to 6, just as in base 10. However, in base 7, after we reach 6, we would hit 2 digits; instead of 7, the next number would be 10.

We would then count from 10 to 16. After we reach 16, instead of 17, we go to 20 and count from 20 to 26.