14,354 reputation
33686
bio website sites.google.com/site/rknmodn
location Halifax, Canada
age 32
visits member for 4 years, 6 months
seen Feb 26 '14 at 5:52

This account is no longer in use.


Oct
20
answered Number of binary numbers with two consecutive zeros
Oct
20
comment Question about units and area of a circle?
Where's this question from? (Looks word-for-word like this question at Yahoo! Answers.) What progress have you made?
Oct
20
revised Seeking a proof of $\sum_{d|n}\phi(\frac{n}{d})a^d\equiv 0 \mod{n}$, where $\phi$ is the Euler Totient Function.
Re-titled; re-tagged
Oct
19
reviewed Leave Open Solving a nonhomogenous differential equation with RHS as $f(x,y)$
Oct
19
comment Solving a nonhomogenous differential equation with RHS as $f(x,y)$
Why? There's nothing wrong with question--it's well-written, polite and shows effort. If only every question here was like this one.
Oct
19
comment $\sum_{k=1}^n a_k^3 = \left(\sum_{k=1}^n a_k \right)^2$
Yes, there's some in the list above, such as [ 3, 3, 3, 3, 6 ] and [ 4, 4, 4, 5, 5, 5, 9 ].
Oct
19
asked For which positive integers n does there exist a prime whose digits sum to n?
Oct
19
reviewed Reject Help! Integrate using substitution method.
Oct
19
revised What prime numbers have the sum of their digits as a prime number?
Well... someone had to edit it.
Oct
19
answered $\sum_{k=1}^n a_k^3 = \left(\sum_{k=1}^n a_k \right)^2$
Oct
19
comment What prime numbers have the sum of their digits as a prime number?
Generalising Tanner L. Sweet's first comment: Repunit primes qualify in any base.
Oct
19
answered Assuming $AB=I$ prove $BA=I$
Oct
19
reviewed Reviewed Determining the roughness of a multidimensional optimization surface
Oct
19
reviewed Reviewed Runge Kutta ODE Solver question
Oct
19
reviewed Reviewed How to show that $1 \over \sqrt{1 - 4x} $ generate $\sum_{n=0}^\infty \binom{2n}{n}x^n $
Oct
19
reviewed Reviewed Understanding Discrete Cosine Transformation
Oct
19
reviewed Reviewed The Riemann Surface of Logarithmic Function
Oct
19
reviewed Reviewed Clairaut's Theorem And continuity of a multivariate function
Oct
19
reviewed Reviewed Finding the limit when there's variable exponents involved
Oct
19
reviewed Reviewed Velocity vector from inertial to body frame