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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