Tips for some of the problems

100		The 3n+1 problem
101		The Blocks Problem
102		Ecological Bin Packing
107		Cats in the Hat
151		Power Crisis
120		Stacks of Flapjacks
122		Trees on the level
126		The Errant Physicist
136		Ugly Numbers
138		Street Numbers
146		ID Codes
150		Double Time
160		Factors and Factorials
167		The Sultan's Successors
177		Paper Folding
190		Circle Through Three Points
195		Anagram
256		Quirksome Squares
264		Count on Cantor
270		Lining Up
271		Simply Syntax
344		Roman Digititis
369		Combinations
377		Cowculations
389		Basically Speaking
400		Unix ls
406		Prime Cuts
412		Pi
424		Integer Inquiry
438		The Circumference of the Circle
440		Eeny Meeny Moo
444		Encoder and Decoder
482		Permutation Arrays
484		The Department of Redundancy Department
499		What's The Frequency, Kenneth?
587		There's treasure everywhere!
602		What Day Is It?
630		Anagrams (II)
636		Squares III
641		Do The Untwist
673		Parentheses Balance
706		LC-Display
713		Adding Reversed Numbers
750		8 Queens Chess Problem
10006		Carmichael Numbers
10013		Super long sums
10014		Simple calculations
10055		Hashmat the brave warrior
10062		Tell me the frequencies!
10070		Leap Year or Not Leap Year and...
10071		Back to High School Physics
10079		Pizza Cutting