SOLUTION: What is the similarity among the numbers 85,17,19,4,2

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Question 1032941: What is the similarity among the numbers 85,17,19,4,2
Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
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Nobody knows.

This problem is posting in this site for years without success.

And, if to be honest, we all just tired of it.

If you have an idea, please share it with us.

If not, please do not vast our time. // It seems, the question is not relevant to the school math and is not relevant to the purposes of this site.

Thank you.