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Nov
10
awarded  Notable Question
Oct
7
revised Prove that $2^{n-1}$ divides $\binom{n}{1} + \binom{n}{3}5 + \binom{n}{5}25 + \binom{n}{7}125 + \cdots$ for $n \geqslant 1$.
edited tags
Oct
7
revised Prove that $2^{n-1}$ divides $\binom{n}{1} + \binom{n}{3}5 + \binom{n}{5}25 + \binom{n}{7}125 + \cdots$ for $n \geqslant 1$.
added 4 characters in body
Oct
7
revised Prove that $2^{n-1}$ divides $\binom{n}{1} + \binom{n}{3}5 + \binom{n}{5}25 + \binom{n}{7}125 + \cdots$ for $n \geqslant 1$.
added 39 characters in body
Oct
7
revised Prove that $2^{n-1}$ divides $\binom{n}{1} + \binom{n}{3}5 + \binom{n}{5}25 + \binom{n}{7}125 + \cdots$ for $n \geqslant 1$.
added 128 characters in body
Oct
7
asked Prove that $2^{n-1}$ divides $\binom{n}{1} + \binom{n}{3}5 + \binom{n}{5}25 + \binom{n}{7}125 + \cdots$ for $n \geqslant 1$.
Sep
24
awarded  Autobiographer
Aug
27
awarded  Necromancer
Dec
7
awarded  Nice Question
Oct
8
answered What the rest of the division $1^6+2^6+…+100^6$ by $7$?
Sep
29
accepted Infinitely many squares in a sequence.
Sep
29
comment Infinitely many squares in a sequence.
@ Don Larynx : thanks.
Sep
29
asked Infinitely many squares in a sequence.
Sep
15
awarded  Popular Question
Dec
6
accepted how to find the volume of this solid of revolution?
Dec
6
asked how to find the volume of this solid of revolution?
Aug
19
awarded  Yearling
Sep
29
comment Fastest prime generating algorithm
less complexity only means that given a large enough n one algorithm will perform better than the other, but that do not mean that for a small n as 10^9 that will always be the case.
Sep
22
comment Is it possible $n(n+1)(n+2)…(n+k)$ is a square?
ops my fact is wrong..sorry
Sep
22
comment Is it possible $n(n+1)(n+2)…(n+k)$ is a square?
cant you just use bertrand postulate an the fact that the largest prime less than n+k divides the product?