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What is the next number to follow 17, 18, 22, 31, 47, ?
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What is the next number to follow 17, 18, 22, 31, 47, ?

User Coppermill
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1 Answer

2 votes

Answer:

72

Explanation:

First differences are ...

18 -17 = 1

22 -18 = 4

31 -22 = 9

47 -31 = 16

We observe that these are square numbers. The next square number is 25, so we expect the next number in sequence to be ...

47 +25 = 72

User Whileone
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