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 first and last character of a string
Number of digits in an integer
Rounding off numbers to n decimals
CONVERT TAN TO SIN
Equal to their cube
Is it an Armstrong number?
give-nth-decimal-place-of-pi up to 100 digits
MATCH THE STRINGS (2 CHAR) very easy
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