Five: 1, 2, 4, 8, 16.
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There are 6,750 such numbers.
Once with a remainder of three or 1.5 times
Divide it by each prime number which does not have remainder.
Nobody knows for sure how many robins there are in a world. These birds are not endangered and there is nobody counting their exact numbers. Estimates are that the number of robins is in the millions.
Eight: 45, 50, 55, 60, 65, 70, 75 and 80.