Brain Teasers
4, 12, 24, 36, 50, 72, 98, 120, 144, ?
What's the next number in this series?
4, 12, 24, 36, 50, 72, 98, 120, 144, ?
4, 12, 24, 36, 50, 72, 98, 120, 144, ?
Answer
180.The nth entry is the nth composite number multiplied by n.
4=4*1, 12=6*2, 24=8*3, 36=9*4, 50=10*5, 72=12*6, 98=14*7, 120=15*8, 144=16*9, 180=18*10.
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Comments
Damn... almost there and gave up...
Dec 27, 2010
GREAT one! Using composite numbers is so much more fun than using prime numbers. It's not so obvious.. it go me thinking. Great work!
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