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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

  • maths -

    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

  • maths -

    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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