how many positive integers less than 1000 have the property that the sum of the digits of each such number is divisible by 7 an the number itself is divisible by 3
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This is a PRERMO question if I'm not mistaken.
I thought the no.s & found that the no.s followed a definite sequence with one no. different from the four & the rest 3 come double of each other. I guess I was getting 20 or something like that.
I thought the no.s & found that the no.s followed a definite sequence with one no. different from the four & the rest 3 come double of each other. I guess I was getting 20 or something like that.
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