SOLUTION: What is the number that starts with three and ends with one that is four digits long and divisible by nine

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Question 1050129: What is the number that starts with three and ends with one that is four digits long and divisible by nine
Answer by ikleyn(53765) About Me  (Show Source):
You can put this solution on YOUR website!
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The number is divisible by 9 if and only if the sum of its digits is divisible by 9.

See the lesson
    - Divisibility by 9 rule
in this site.

Therefore 3771, 3681, 3861, 3051 are the solutions, for example.