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
Determine if a Given Number is a Triangle Number
Add two numbers
sum of non-primes
Number of digits in an integer
construct matrix with identical rows
given 4x4 matrix swap the two middle columns
match 2 string
give-nth-decimal-place-of-pi up to 100 digits
check wether armstrong no or not
convert tan to sin
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