Collatz Streetmap

• File of first 10K Collatz sequences, ascending start values, with lengths
• The Collatz-Problem. A view into some 3x+1-trees and a new fractal graphic representation. Gottfried Helms, Univ. Kassel
• Collatzfolgen und Schachbrett auf Wikibooks

Patterns in similiar sequences

• 142, 143 with same length (from A070165):

142/104: [142,  71, 214, 107, 322, 161, 484,  242, 121, 364, 182, 91, ... 10, 5, 16, 8, 4, 2, 1]
143/104: [143, 430, 215, 646, 323, 970, 485, 1456, 728, 364, 182, 91, ... 10, 5, 16, 8, 4, 2, 1]
           +1 *6+4   +1 *6+4   +1 *6+4   +1  *6+4 *6+2    =    =  ...