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Edward Porcella's user avatar
Edward Porcella's user avatar
Edward Porcella's user avatar
Edward Porcella
  • Member for 10 years, 8 months
  • Last seen more than a month ago
  • California, United States
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Retired teacher in liberal arts: classic texts in literature, philosophy, mathematics and natural science. Partial to primes, to integers generally, and to determining the best that elementary number theory can do toward proving Fermat's Last Theorem.

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5
If y forms Pythagorean triples with two different x, can some other y also form Pythagorean triples with those two x?
Mar 28, 2014
question
3
Do more than three integers $n$ have divisor sums which are odd squares?
Apr 3, 2014
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8
Proving “The sum of $n$ consecutive cubes is equal to the square of the sum of the first $n$ numbers.”
8
What is the radius of the small circle relative to the big circle?
7
Deductions about the prime factorization of odd integers $m>1$ satisfying $\frac{-3+\sqrt{1+8m}}{2}=\prod_{\substack{p\mid m\\p\text{ prime}}}(p-1)$
6
Counting the number of triangles inside $3-4-5-$triangle [Found in Arabic Math book: الرياضيات | هندسة الإحداثيات | الإحصاء]
5
Five circles in a rectangle: can the circles move?