step:(1)       (2,3a)     (3c)              (3b)                    (4)
 col:   1         2      3   4          5                6             7
     (1987)                  e                          8n+5
     42389      42389    2   s    (2*(24n+5)-1)/3      16n+3       5832n+1565
     28259      28259    2   s    (2*(48n+35)-1)/3     32n+23      3888n+1043
o:   18839      18839    2   s    (2*(96n+23)-1)/3     64n+15      2592n+695
                12559    1   b   (4*(192n+79)-1)/3    256n+105     1728n+463
                16745    2   s   (2*(768n+617)-1)/3   512n+411     2304n+617
                11163    0   t      1536n+411                      1536n+411

Figure 9. Worksheet showing details of characterization of an integer (18839) in the abstract predecessor tree.


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