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Is 2048 the highest power of 2 with all even digits (base ten)?
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Are there $a,b>1$ with $a^4\equiv 1 \pmod{b^2}$ and $b^4\equiv1 \pmod{a^2}$?
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On the zeta sum $\sum_{n=1}^\infty[\zeta(5n)1]$ and others
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Is the clustering of prime powers merely coincidental?
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Solution in integers to $2^n+n=3^m$
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Convergence of the sequence $\sqrt{1+2\sqrt{1}},\sqrt{1+2\sqrt{1+3\sqrt{1}}},\sqrt{1+2\sqrt{1+3\sqrt{1+4\sqrt{1}}}},\cdots$
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Can $p^{q1}\equiv 1 \pmod {q^3}$ for primes $p<q$?
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are there infinitely many triples of consecutive squarefree integers?
mar 27 '11
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Can we approximate an arbitrary function as a (probably infinite) sum of bell shapes?
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find the minimum difference between the factors of a number
jun 2 '12
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Primality criteria for specific class of Wagstaff numbers ?
apr 5 '12
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Root estimation
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