First:
I try use formula x/2^n
Which means "n"= the key must be start
"x" = the private key
Example for key wallet 60= fc07a1825367bbe->to decimal(1135041350219496382)
=1135041350219496382/2^n
=1135041350219496382/576460752303423488
=1.9689828764301732198782612925924695446155965328216552734375
from there maybe 75 or 25 means some thing about next wallet or how much number length need
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
60. 1.9689828764301732198782612925924695446155965328216552734375 (800000000000000~FFFFFFFFFFFFFFF)
59. 1.8217038442259546014712068284779888927005231380462646484375 (400000000000000~7FFFFFFFFFFFFFF)
58. 1.387616882344719700104196391521327313967049121856689453125 (200000000000000~3FFFFFFFFFFFFFF)
57. 1.918545307495002238962200635796762071549892425537109375 (100000000000000~1FFFFFFFFFFFFFF)
56. 1.2273166453323929026009153631093795411288738250732421875 (80000000000000~FFFFFFFFFFFFFF)
55. 1.6678542153963615835010614318889565765857696533203125 (40000000000000~7FFFFFFFFFFFFF)
54. 1.10738698705333893368418785030371509492397308349609375 (20000000000000~3FFFFFFFFFFFFF)
53. 1.50183953528462676985100188176147639751434326171875 (10000000000000~1FFFFFFFFFFFFF)
52. 1.8725002169265092533123606699518859386444091796875 (8000000000000~FFFFFFFFFFFFF)
51. 1.828554654496162612531406921334564685821533203125 (4000000000000~7FFFFFFFFFFFF)
50. 1.08560360020207014031257131136953830718994140625 (2000000000000~3FFFFFFFFFFFF)
49. 1.453482330164934666072440450079739093780517578125 (1000000000000~1FFFFFFFFFFFF)
48. 1.35860726900065031941267079673707485198974609375 (800000000000~FFFFFFFFFFFF)
47. 1.700565506925073577804141677916049957275390625 (400000000000~7FFFFFFFFFFF)
46. 1.4611222908516765528474934399127960205078125 (200000000000~3FFFFFFFFFFF)
45. 1.13666732696611916253459639847278594970703125 (100000000000~1FFFFFFFFFFF)
44. 1.7513186500162873926456086337566375732421875 (80000000000~FFFFFFFFFFF)
43. 1.684795972283836817950941622257232666015625 (40000000000~7FFFFFFFFFF)
42. 1.31666390755663087475113570690155029296875 (20000000000~3FFFFFFFFFF)
41. 1.3262726544298857334069907665252685546875 (10000000000~1FFFFFFFFFF)
40. 1.82563128500987659208476543426513671875 (8000000000~FFFFFFFFFF)
39. 1.17770457631922909058630466461181640625 (4000000000~7FFFFFFFFF)
38. 1.069358670734800398349761962890625 (2000000000~3FFFFFFFFF)
37. 1.458852211289922706782817840576171875 (1000000000~1FFFFFFFFF)
36. 1.233646470936946570873260498046875 (800000000~FFFFFFFFF)
35. 1.170723221264779567718505859375 (400000000~7FFFFFFFF)
34. 1.645306143560446798801422119140625 (200000000~3FFFFFFFF)
33. 1.66181426309049129486083984375 (100000000~1FFFFFFFF)
32. 1.440510532818734645843505859375 (80000000~FFFFFFFF)
31. 1.958001918159425258636474609375 (40000000~7FFFFFFF)
30. 1.924414344131946563720703125 (20000000~3FFFFFFF)
29. 1.492756955325603485107421875 (10000000~1FFFFFFF)
28. 1.696008503437042236328125 (8000000~FFFFFFF)
27. 1.66818411648273468017578125 (4000000~7FFFFFF)
26. 1.625384747982025146484375 (2000000~3FFFFFF)
25. 1.978010475635528564453125 (1000000~1FFFFFF)
24. 1.720032215118408203125 (800000~FFFFFF)
23. 1.334858417510986328125 (400000~7FFFFF)
22. 1.434089183807373046875 (200000~3FFFFF)
21. 1.727832794189453125 (100000~1FFFFF)
20. 1.6466464996337890625 (80000~FFFFF)
19. 1.363887786865234375 (40000~7FFFF)
18. 1.51572418212890625 (20000~3FFFF)
17. 1.4621429443359375 (10000~1FFFF)
16. 1.57196044921875 (8000~FFFF)
15. 1.63983154296875 (4000~7FFF)
14. 1.287109375 (2000~3FFF)
13. 1.2734375 (1000~1FFF)
12. 1.31005859375 (800~FFF)
11. 1.1279296875 (400~7FF)
10. 1.00390625 (200~3FF)
9. 1.82421875 (100~1FF)
8. 1.75 (80~FF)
7. 1.1875 (40~7F)
6. 1.53125 (20~3F)
5. 1.3125 (10~1F)
4. 1 (8~F)
Let me know if you know some thing
![Huh](https://bitcointalk.org/Smileys/default/huh.gif)