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'Hard Life' problem has number 159. Pred problem 'Emirp primE' has number 157. Where is a 158-th problem?
It is not error... :)
The problem is that I've started inventing the Problem #158
, but later found I have troubles with my own solution for it so it's associated data exist but could not be published.
I think that I will replace it with another exercise, which will then be published with #158
.
Sorry for this little mess!