(16728, 1) (8364, 2) (5576, 3) (4182, 4) (2788, 6) (2091, 8) (1394, 12) (984, 17) (697, 24) (492, 34) (408, 41) (328, 51) (246, 68) (204, 82) (164, 102) (136, 123)
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Numbers for which the sum of the digits is divisible by 9. This is also true for 3. There are other divisibility/multiple tests for other numbers (e.g., numbers that are divisible by 5 end in 5 or 0; numbers whose last two digits are divisible by 4 are divisible by 4)
No factor of 10999 is divisible by 10998. Apart from 1 and 2, any pair of consecutive numbers must be co-prime: that is, they cannot have any prime factor in common.
The lists of numbers divisible by and not divisible by 600 are both infinite.
All even numbers are divisible by 2.
Odd numbers