1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340.
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340
340
there are an infinite number of these. Take each natural number, remembering that these are the numbers, 1,2,3,4,5... and multiply it by 340 and those are the multiples.
340
Oh, dude, it's like super simple. Numbers that round to 350 to the nearest 10 are those between 345 and 354. So, that's like 10 numbers in total. Easy peasy lemon squeezy.