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2 x 420 3 x 280 4 x 210 5 x 168 6 x 140
There are a lot like 3x56x5 and there are a thousand more but i just don't want to write them all :)
Well, honey, in the number 840, there are 4 longest strings: "8", "4", and two "0"s. Looks like you hit the jackpot with those long strings, but don't get too excited - they're just numbers, after all.
You will know because all of the numbers are prime.
No. 7 doesn't.