sam hocevar
Reputation
531
Top tag
Next privilege 1,000 Rep.
Create new tags
 Mar 13 comment What is the sum of the reciprocal of all of the factors of a number? @N.S.JOHN it’s likely that you made a mistake somewhere, $f$ doesn’t reach the value $11.5$ until about $n = 10^{276}$. Mar 12 comment What is the sum of the reciprocal of all of the factors of a number? Here are plots for the first 100k integers: i.imgur.com/XDyVK7p.png and for the first 10 million: i.imgur.com/y5SYGOd.png The largest value in this range is obtained for $8648640 = 2^6 × 3^3 × 5× 7 × 11× 13$ Dec 22 awarded Nice Answer Sep 23 answered What is the smallest value of $x^2+y^2$ when $x+y=6$? Jul 30 awarded Yearling Jul 28 answered Can the golden ratio accurately be expressed in terms of e and $\pi$ Feb 15 answered Formal proof for $(-1) \times (-1) = 1$ Dec 18 comment Can't argue with success? Looking for “bad math” that “gets away with it” Maybe this could be explained? I had to Google for what it meant because I have never learned to write down a division like that. Jun 4 awarded Yearling Apr 21 comment Getting the sequence $\{1, 0, -1, 0, 1, 0, -1, 0, \ldots\}$ without trig? @bodacydo - your solution is not a solution; it never outputs -1. Apr 15 answered Getting the sequence $\{1, 0, -1, 0, 1, 0, -1, 0, \ldots\}$ without trig? Apr 15 comment Getting the sequence $\{1, 0, -1, 0, 1, 0, -1, 0, \ldots\}$ without trig? Probably not the fastest, because there is (((x+3)>>1)&1) - ((x>>1)&1). Jan 11 awarded Nice Answer Jan 10 awarded Critic Jan 10 awarded Editor Jan 10 revised Proving the inequality $e^{-2x}\leq 1-x$ shorter proof Jan 10 awarded Teacher Jan 10 answered Proving the inequality $e^{-2x}\leq 1-x$ Dec 15 comment Fast 2D Line Triangle Intersection test Sorry, please disregard; they're projection directions, all right. Dec 15 comment Fast 2D Line Triangle Intersection test For the fourth direction, don't you mean the vector normal to the line segment instead?