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we can use only 1,3,5,7,9,11,13,15
you can also repeat number
It is only possible if we keep decimal or exponential numbers.
actually, in a sense, we can do it without exponents or expressiom


There are many mock answers to this question, but a logical answer has not yet been found.

Proof that this question is not mathematically solvable unless it is a riddle
Take any number, say "x". In the expression y=x, y could be either odd or even. To make it even, we change the expression to y=2x.
Here, y is an even number since y=2x and every even number is a multiple of 2 and every multiple of 2 is an even number.
Even here, only y is an even number. "x" could might as well be an odd number. But even if so, a perfect double or a multiple of 2 is always an even number.
Then, if the expression y=2x is an even number indeed, then the expression y=2x+1 or y=2x-1 will be odd since every even number is succeeded and preceded by an odd number. Since 30-1 or 30+1 are not even, y=2x +1 or y=2x-1 will never be 30.

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