يمكن اعتبار المشكلة التي يثيرها هي مشكلة رياضية غير محلولة بعد وقد سميت باسم Lothar Collatz الذي اكتشفها عام 1937 م.

Povzetek

Directed graph showing the orbits of the numbers less than 30 (with the exception of 27 because it would make it too tall) under the Collatz map.

For a larger graph containing only odd numbers, see Image:Collatz-graph-300.svg.

Created with Graphviz, with the help of this Python program:

dotfile = file('collatz-graph.dot', 'w')

limit = 30

def f(n):
  if n % 2 == 0:
    return n / 2
  else:
    return 3*n + 1

explored = set([1,27]) # 27 has a long convergence, so skip it

dotfile.write('digraph {\n')

for n in range(2, limit):
  while n not in explored:
    dotfile.write(str(n) + ' -> ')
    explored.add(n)
    n = f(n)
  dotfile.write(str(n) + ';\n')

dotfile.write('}\n')

enSVG razvoj

 

Izvorna koda te SVG-datoteke je veljavna.

 

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Izvorna koda

dotfile = file('collatz-graph.dot', 'w')
 
 limit = 30
 
 def f(n):
   if n % 2 == 0:
     return n / 2
   else:
     return 3*n + 1
 
 explored = set([1,27]) # 27 has a long convergence, so skip it
 
 dotfile.write('digraph {\n')
 
 for n in range(2, limit):
   while n not in explored:
     dotfile.write(str(n) + ' -> ')
     explored.add(n)
     n = f(n)
   dotfile.write(str(n) + ';\n')
 
 dotfile.write('}\n')

Licenca

To delo je dal v javno domeno njegov avtor I, Keenan Pepper. To velja po vsem svetu. V nekaterih državah to pravno morda ni mogoče. Če je tako, I, Keenan Pepper daje (v okviru zakonskih omejitev) vsakomur brezpogojno pravico, da gradivo uporablja v kateri koli namen.