Number sequence!

What is the 9th term in this sequence?

2 , 4 , 6 , 13 , 22 , 35 , 60 2, 4, 6, 13, 22, 35, 60

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215 115 125 235

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1 solution

Astro Enthusiast
Aug 3, 2014

This series is on base 7 7 . When converted to base 10 10 , the sequence goes like this: 2 , 4 , 6 , 10 , 16 , 26 , 42 2, 4, 6, 10, 16, 26, 42 where in from the third term, it is the sum of the two previous terms. :D 9th term would be 110 110 , converted to base 7 7 will give us 215 \boxed {215}

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