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Look for 3 sevens (Posted on 2016-04-01) Difficulty: 2 of 5
Find the smallest number N with the property that its first 3 multiples (i.e. N,2N,3N) contain the digit 7.

Analytical solution preferred.

Bonus: Same for the first 4 multiples.

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
Solutioncomputer finds overlooked valuesCharlie2016-04-01 10:48:18
the rough wayarmando2016-04-01 09:34:52
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