# maths

posted by ashley

my number is less than 100 one more than a multiple of 3 one of its digits is prime if you reverse its digits you get a prime it has exactly four factors the sum of digits is prime if you miltiply it by 5 it is greater than 100

1. Steve

the last sentence says 21 <= n <= 99

one digit prime and n=3k+1 means we have something in

25,34,43,52,58,61,67,70,76,79,85,91,94

reverse digits is prime means we have

34,67,91

sum of digits is prime means

34,67

four factors leaves
34, which has factors 1,2,17,34

2. 657

am a factor of 36 and a multiple of 4 i am not a prime number i am not a factor of 50 what number am i

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