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155906

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First name
Tianyi Shan
School
Morley Memorial Primary School
Country
United Kingdom, UK
Age
7

It is 383.
1) hundred: x; tenth:y. digit: z
2) x+y+z=14,
3) 100<xyz < 500
4) Prime
167,239,257,293,383,419,491
5) biggest-smallest = 5
257, 383, 419, 491
6) palindromic
383