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9h

comment 
Historical (personal) examples of teachingbased research
This question is not a million miles removed from one I asked here, mathoverflow.net/questions/39061/… 
1d

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Avoiding Fibonaccilike sequences
I think if you search for "sumfree sets" you'll find a lot of work on these. Alternatively, figure out the first few terms, and look it up in the OEIS. 
1d

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Need a calculator to evaluate function at irregular input values
Wrong site  we do questions of math research here at MO. 
1d

revised 
Roots of 3 polynomials in two variables in terms of the coefficients
formatting, typos 
1d

comment 
Roots of 3 polynomials in two variables in terms of the coefficients
"Unclear what you're asking"? Two polynomials in one variable do not have a common zero if the determinant of the Sylvester matrix is not zero. Isn't it clear that OP is asking whether there's anything like the Sylvester matrix for three polynomials in two variables? 
1d

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Is there an algorithm to solve quadratic Diophantine equations?
@Turbo, on the cited page of Garey & Johnson, they say "Transformation from 3SAT." 
1d

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Is there an algorithm to solve quadratic Diophantine equations?
@Turbo, have you had a look at the Manders & Adleman paper? 
2d

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Prize allocation of scratch codes to ensure correct number of prizes to give away
MO is for questions of math research (as you might have been able to work out for yourself). 
2d

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How can i change 8_19 to (3,4)torus knot K(3,4)?
You might want to provide a link to some place where we can see what $8_{19}$ is. 
2d

revised 
Consecutive numbers with mutually distinct exponents in their canonical prime factorization
formatting, added link. 
Mar 29 
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What is the status on questions related to Bhargava's factorial function?
The paper was published: Bhargava, Manjul, The factorial function and generalizations, Amer. Math. Monthly 107 (2000), no. 9, 783–799, MR1792411 (2002d:05002). The review mentions 5 citations in other reviews, and 30 citations in references in other reviews. If you have access to Math Reviews, tracking those down should keep you busy. . . 
Mar 29 
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What is the status on questions related to Bhargava's factorial function?
What does "find $a_1$ giving the smallest power of $(a_1a_0)$" mean? [and why would this question get migrated away from math.stackexchange?] 
Mar 29 
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How close can one get to the missing finite projective planes?
Albanian${}{}$? 
Mar 29 
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Does this inequality always hold?
This clarification should be edited into the body of the question, so people don't have to go searching the comments to find it, liuchun. 
Mar 28 
awarded  Deputy 
Mar 27 
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Angle subtended by the shortest segment that bisects the area of a convex polygon
Is there a simple example where you get $\pi/3$? 
Mar 26 
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Uninteresting questions with interesting answers
@Todd, what I meant was, by our upvotes and downvotes on answers, users are deciding deciding which questions are uninteresting. "How many primes are there" is currently at minus 2; the voters seem to agree that that question is not uninteresting. Joe Silverman's answer is at plus 33; the voters seem to agree that that question is uninteresting. It might be somewhat subjective, but there's also a fair bit of agreement here. 
Mar 26 
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Closed Form Solutions To Simple Iterated Polynomial Building Blocks
This site is not for professional mathematicians only, but the questions are expected to be at the research level. 
Mar 26 
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Uninteresting questions with interesting answers
@Todd, you could always let the voters decide which questions are uninteresting. 
Mar 25 
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For which sidelengths are there polyominos composed of three squares that tile the plane?
What's the smallest triple that doesn't satisfy any of those equations? 