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

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 
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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