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Semiprime Names (Posted on 2010-12-06) Difficulty: 3 of 5
Six is a semiprime (the product of two primes). Its name, written in English, has 3 letters and 3 is one of the two primes that produce 6.

What 2-digit semiprime is like that?

What is the smallest such 3-digit semiprime?

What is the smallest such 4-digit semiprime?

Consider two cases for each:

  • Use the word "and" in all numbers such as "one-hundred and one".
  • Don't use the word "and" in those numbers.

In any event, don't use locutions such as "nineteen hundred"; rather, use "one thousand nine hundred" for this example.

See The Solution Submitted by Charlie    
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solution Comment 2 of 2 |

2-digit semiprime:
33 thirty-three (11 * 3)

3-digit semiprime:
253 two hundred and fifty-three (23 * 11)
551 five hundred fifty-one (19 * 29)

4-digit semiprime:
1007 one thousand and seven (19 * 53)
1147 one thousand one hundred forty-seven (31 * 37)


  Posted by Dej Mar on 2010-12-07 06:30:47
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