416 and 418.
451
425
420
420
420
420.
412, 414, 416, 418, 420, 422, 424, 426. Excluding the 412 and 426, there are 6 even numbers.
420 is a composite, as are ALL even numbers - with the exception of the number 2.
There are 82 prime numbers between 1 and 420.
420
It gets very close at 415 kph, just a tad bit shy of the fabled 420.
The sum of the first 20 even numbers... is 110
Composite. All even numbers except the number '2' are composite.
I am not sure if any two consecutive numbers can add up to an even number.