There exists one logic in between input and output. Find it (easy math).
x=13 then y=339;
x=26 then y=1353;
2*x^2 + 1 :P
Return the 3n+1 sequence for n
Which values occur exactly three times?
Which doors are open?
Divisors of an integer
Is it an Armstrong number?
CONVERT TAN TO SIN
Given a 4x4 matrix, swap the two middle columns
Who invented zero?
Simple date to serial no. conversion
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