Yes, 305 is divisible by 305. =)
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Well, honey, let's break it down. 305 is not divisible by 2, 3, 5, or 6 because it's an odd number and doesn't meet the divisibility rules for those numbers. As for 9 and 10, nope, it doesn't work for them either because the sum of the digits of 305 isn't divisible by 9, and it doesn't end in 0 for 10. So, in short, 305 is a lone wolf that can't be divided by any of those numbers.
1, 3, 5, 15, 61, 183, 305, 915.
Only 315. To be divisible by 3 numbers have to add to a number divisible by 3 (3+1+5 =9). To be disable by 5, number has to end in a 5 or 0
305
305 x 5 = 1525