Recent content by nikolany

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    Is there a Continuous Function f:R-->R Discontinuous at All Other Numbers?

    So f(x)=(x-π)^18 for x rational and 0 otherwise should work I think! Thank you very much
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    Is there a Continuous Function f:R-->R Discontinuous at All Other Numbers?

    Is there a function f:R-->R that is continuous at π and discontinuous at all other numbers? Thx
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    Undergrad Are there any other twin primes with this property?

    The twin primes 5 and 7 are such that one half their sum is a perfect number. Are there any other twin primes with this property? It works for p=5. I think it should be of the form 1/2*(p+P+2). Is this true? How can I prove it? Thx
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    Let (a,b)=1 and ab=c^2. Show that a and b are perfect squares.

    hi all I need some help with this question Let (a,b)=1 and ab=c^2. Show that a and b are perfect squares. Thank you