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Puzzlehunt 2014

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Mersenne Tree

h(x) = 3e6649072509c4981fbf78a96815361aeef6bc65568b09a5d7c52b3829e8d0b5

Solution

author: unknown

h(x) looks like a cryptographic hash, and refreshing the page shows it changes every 5s. We find that the SHA256 hash of the unix time (floored by 5 seconds) gives us the same hash. Thus the answer is the current unix time (and values within ± a minute are accepted).