44 Questions

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when $F_n^2+F_m^2$ is a square for fibonacci numbers

May 8 '15 at 18:15 Elaqqad 11.7k
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Looking for all sequences such that $a_i^2+a_j^2=a_k^2+a_l^2$ whenever $i^2+j^2=k^2+l^2$

Apr 9 '15 at 12:21 punctured dusk 14.9k

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For a given integer $n$, how many primes $p_1,p_2 \leq n$ such that $\tau(p_1-1)=\tau(p_2-1)$

Nov 14 '15 at 16:50 Elaqqad 11.7k
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Is there a formula for $\sum_{n=0}^{+\infty} q^{n^3}$?

Feb 4 '15 at 16:56 Elaqqad 11.7k

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Is the sequence generated by two permutations periodic?

Apr 20 '15 at 13:43 Elaqqad 11.7k
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Is there a strong version of twin prime conjecture?

Mar 21 '15 at 23:04 user26486 9,350
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The number of solution of a Diophantine equation

Jan 24 '15 at 14:25 punctured dusk 14.9k

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