Are (the Euler–Mascheroni constant), π+e, π-e, πe, π/e, πe, π√2, ππ, eπ2, ln π, 2e, ee, Catalan's constant or Khinchin's constant irrational?[2][3][4][5][6][7][8]

Question

Are  (the Euler–Mascheroni constant), π+e, π-e, πe, π/e, πe, π√2, ππ, eπ2, ln π, 2e, ee, Catalan's constant or Khinchin's constant irrational?[2][3][4][5][6][7][8]

experimentx · Answer

irrationality of 
pi + e
pi*e 
has not been determined yet

experimentx · Answer

http://www.wolframalpha.com/input/?i=is+e+%2B+pi+irrational

experimentx · Answer

I'm not quite familiar with Catalan's constant ... but according to wikipedia it hasn't been determined yet http://en.wikipedia.org/wiki/Catalan's_constant

experimentx · Answer

same goes for the Euler-Mascheroni's constant http://en.wikipedia.org/wiki/Euler%E2%80%93Mascheroni_constant