Apparently, this user prefers to keep an air of mystery about them.
7 Find all numbers $p$ such that all six numbers $p$, $p+2$, $p+6$, $p+8$, $p+12$, $p+14$ are primes dec 27 '12
3 Show $GCD(a_1, a_2, a_3, \ldots , a_n)$ is the least positive integer that can be expressed in the form $a_1x_1+a_2x_2+ \ldots +a_nx_n$ mar 19 '14
0 If $n>$1 and $S_n= \frac12 + \frac13 +\cdots + \frac1n$, show $S_n$ is not an integer. [duplicate] mar 19 '14
0 Do the set of functions mapping real numbers to real numbers form a group under composition? feb 12 '14