André Nicolas
Reputation
393/400 score
 6h revised $7^{6} | (a+b+ab)^2$ Find the value of $a,b$ added 241 characters in body 18h revised Expectation number of games until A or B wins in 2 consecutive games deleted 483 characters in body 23h revised Are there an infinite number of prime numbers where removing any number of digits leaves a prime? added 37 characters in body 1d revised Find the probability of getting one diamond and one spade in a five-card hand, using binomial coefficients. added 1 character in body 1d revised Find all prime p such that Legendre symbol of $\left(\frac{10}{p}\right)$ =1 added 175 characters in body 1d revised Are there an infinite number of prime numbers where removing any number of digits leaves a prime? added 22 characters in body 2d revised Elementary number theory with some arithmetic progression. u 2d revised $xP(|X|>x) \rightarrow 0$ implies $E|X|^{1-\epsilon} < \infty$ added 135 characters in body 2d revised Prove $O(f(n)+g(n)) = O(f(n))$ when $g(n)=O(f(n))$ added 683 characters in body 2d revised How to read this problem from Dummit-Foote's “Abstract Algebra”? added 8 characters in body 2d revised at what interest rate can one double his initial deposit after 3 years, if the interest is compound semiannually? 24.5% 0.245% 112.25% 1.12% added 228 characters in body 2d revised Geometric, Arithmetic Progression added 63 characters in body 2d revised Geometric, Arithmetic Progression added 92 characters in body 2d revised How many $5$-digit numbers (including leading $0$'s) are there with no digit appearing exactly $2$ times? added 19 characters in body 2d revised How many $5$-digit numbers (including leading $0$'s) are there with no digit appearing exactly $2$ times? added 86 characters in body Apr 30 revised Charmichael number square free added 42 characters in body Apr 29 revised Finding the sum of all products of pairs of distinct primitive roots mod 83 added 89 characters in body Apr 29 revised Finding the sum of all products of pairs of distinct primitive roots mod 83 deleted 53 characters in body Apr 29 revised If $f'(x)\rightarrow \infty$ then $f(x)\rightarrow\infty$? added 11 characters in body Apr 29 revised Find the sum using added 967 characters in body