Posted by **Kris** on Sunday, November 30, 2008 at 3:31pm.

I am a prime number between 40 and 50. If you add one to me, the sum of the prime factors of that composite number is 11. What number am I?

- Math -
**Damon**, Sunday, November 30, 2008 at 3:40pm
I must be one of:

41

43

47

so add 1

42

44

48

so

42 = 2*3*7 and sum = 11, remarkable

44=2*2*11 nope

48=2*2*2*2*3 nope

- Math -
**Damon**, Sunday, November 30, 2008 at 3:41pm
So I think 41

- Math -
**Umm**, Thursday, September 10, 2015 at 9:53pm
41+1=42=2*3*7...2+3+7=12

43+1=44=2*2*11...2+2+11=15

47+1=48=2*2*2*2*3=2+2+2+2+3=11

47 is the answer

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