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Physics
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akusaja
  • Member for 11 years, 2 months
  • Last seen more than 9 years ago
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100
How to find a general sum formula for the series: 5+55+555+5555+.....?
12
How many pairs of positive integers $(x,y)$ satisfy the equation $x^2 - 10! = y^2$?
7
Is $e^{i+\pi}$ irrational or not?
6
Integer solutions to $a^{2014} +2015\cdot b! = 2014^{2015}$
6
How to find the general formula for this recursive problem?