25
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"Four, four, four, ..." droned the random number generating monster. "Are you sure that's random?" I asked. "That's the problem with randomness, you can never be sure!" he replied. But suddenly the long string of 4s was broken up by an 8, then later a 12, before he returned to his 4s.

Can you complete the following sequence? The answer is not random.

4, 4, 4, 4, 8, 4, 4, 4, 4, 12, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, ?

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31
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I think the next number is

5 - giving the gaps between the years the modern Summer Olympic Games took place.

The number sequence goes as

steps of 4 from I Athens 1896 to V Stockholm 1912
gap of 8 to VII Antwerp 1920
steps of 4 to XI Berlin 1936
gap of 12 to XIV London 1948
steps of 4 to XXXI Rio de Janeiro 2016
gap of 5 to XXXII Tokyo which was held in 2021

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    $\begingroup$ Wow! I wonder how someone can even think in these lines to come up with such an awesome answer! No wonder you have such a reputation score! $\endgroup$ Aug 23 at 18:21

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