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 generation tree.