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User:Vjeran Crnjak
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I was born and raised in Croatia. I graduated from the University of Zagreb.
Personal page: http://vjeran.crnjak.xyz/
I find sequences related to the lottery problem (https://en.wikipedia.org/wiki/Lottery_mathematics#Minimum_number_of_tickets_for_a_match) and superpermutations (https://en.wikipedia.org/wiki/Superpermutation , http://oeis.org/A180632) very interesting (both seem to be hard to calculate).