Equal Sums of Like Powers

The Fifth Taxicab Number is 48988659276962496
David W. Wilson's article on his search for the smallest integer that can be expressed as a sum of two positive cubes in 5 distinct ways, up to order of summands.
http://www.cs.uwaterloo.ca/journals/JIS/wilson10.html

Mathematician's Secret Room
Unsolved problems in Number Theory. English and Japanese text by Hisanori Mishima.
http://www.asahi-net.or.jp/~KC2H-MSM/mathland/overview.htm

Power Page
Steve Dutch's page about powers of numbers.
http://www.uwgb.edu/dutchs/RECMATH/rmpowers.htm

Sortedsums
D. J. Bernstein's collection of tools for enumerating small solutions to certain types of equal sums of like powers.
http://cr.yp.to/sortedsums.html

Taxicab Numbers
David W. Wilson's list of the smallest number that can be expressed as a sum of two positive cubes in n different ways, for n = 1 through 5.
http://pi.lacim.uqam.ca/eng/problem_en.html

Tom's Mathematical Things
Dissertation about equal sums of like powers by Tom Womack.
http://tom.womack.net/maths/dissert_abstract.htm