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The first fifteen counting numbers in base five are: 1, 2, 3, 4, 10, 11, 12, 13, 14, 20, 21, 22, 23, 24, and 30. In base five, each digit represents a power of 5, so the counting numbers follow a pattern of increasing powers of 5. The number 10 in base five represents the quantity of one five and zero units, similar to how 10 in base ten represents one ten and zero units.
1+1+1+1+1+=5 * * * * * The question did not ask for the sum of the first counting number five times! The sum of the first 5 counting numbers is 1+2+3+4+5 = 15. Such sums are known as triangular numbers.
Triangle numbers or triangular numbers are those numbers that can form an equilateral triangle when counting the objects. The first five triangular numbers are: 1, 3, 6, 10, 15.
The first five whole numbers are: 01234. The first five natural numbers are: 12345.
They are the only numbers that have 4 letters, not counting zero: Four Five Nine.