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Which number should come next in these series ? Difficulty increases after each question.

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Last updated: July 21, 2016

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First submitted	July 21, 2016
Times taken	2,466
Average score	57.1%
Rating	4.17
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Hint	Answer
1, 2, 3, 4, 5, ?	6
3, 6, 9, 12, 15, ?	18
3, 6, 12, 24, 48, ?	96
4, 5, 7, 10, 14, ?	19
4, 6, 10, 18, 34, ?	66
8, 15, 24, 35, 48, ?	63
17, 25, 32, 37, 47, ?	58

Hint	Answer
25, 54, 83, 112, 141, ?	170
35, 24, 19, 32, 39, 28, 23, ?	36
15, 27, 42, 84, 168, ?	336
31, 71, 12, 52, 92, ?	33
59, 14, 19, 29, 40, 44, 52, 59, ?	73
43, 54, 31, 17, 22, 16, ?	14
142, 562, 586, 9016, 14201, 64562, ?	701867

Level 21

Dec 10, 2018

I got 13/14 in first try!very very happy

Level 47

Jul 20, 2019

expain 33 and the last one.

Level 43

May 10, 2020

For 33, the easiest way to explain is switch the tens and ones places and its just adding 4. Not sure about the last one though...

Level 56

Sep 18, 2020

Add 40 (31->71), subtract 59 (71->12), add 40 twice (12->52->92), subtract 59 again (92->33)

Level 75

Jan 2, 2021

The way I read it was that the first digit is incremented by 4 each time; if it overflows, increment the last digit

Level 38

Sep 29, 2021

Can anyone explain the second to last please? The 43, 54, 31…..

Level 53

Oct 1, 2021

it is a sum of products of opposite digits of preceding and following number

43, 54 --> (4*4) + (3*5) = 31

54, 31 --> (5*1) + (4*3) = 17

31, 17 --> (3*7) + (1*1) = 22

...

22, 16 --> (2*6) + (2*1) = 14

Level 56

Jan 12, 2023

Can anybody explain the last one please?

Level 37

Mar 20, 2023

Can someone explain the last one please? Thx

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