I don't have math or computer science training and I don't understand what happens at W=61. Or do I just have it all wrong?
27 data _null_;
28 length x $64;
29 a=1;
30 do w=1 to 64;
31 x=putn(a,'binary',w);
32 put w 2. +1 x $char64.-r;
33 end;
34 run;
1 1
2 01
3 001
4 0001
5 00001
6 000001
7 0000001
8 00000001
9 000000001
10 0000000001
11 00000000001
12 000000000001
13 0000000000001
14 00000000000001
15 000000000000001
16 0000000000000001
17 00000000000000001
18 000000000000000001
19 0000000000000000001
20 00000000000000000001
21 000000000000000000001
22 0000000000000000000001
23 00000000000000000000001
24 000000000000000000000001
25 0000000000000000000000001
26 00000000000000000000000001
27 000000000000000000000000001
28 0000000000000000000000000001
29 00000000000000000000000000001
30 000000000000000000000000000001
31 0000000000000000000000000000001
32 00000000000000000000000000000001
33 000000000000000000000000000000001
34 0000000000000000000000000000000001
35 00000000000000000000000000000000001
36 000000000000000000000000000000000001
37 0000000000000000000000000000000000001
38 00000000000000000000000000000000000001
39 000000000000000000000000000000000000001
40 0000000000000000000000000000000000000001
41 00000000000000000000000000000000000000001
42 000000000000000000000000000000000000000001
43 0000000000000000000000000000000000000000001
44 00000000000000000000000000000000000000000001
45 000000000000000000000000000000000000000000001
46 0000000000000000000000000000000000000000000001
47 00000000000000000000000000000000000000000000001
48 000000000000000000000000000000000000000000000001
49 0000000000000000000000000000000000000000000000001
50 00000000000000000000000000000000000000000000000001
51 000000000000000000000000000000000000000000000000001
52 0000000000000000000000000000000000000000000000000001
53 00000000000000000000000000000000000000000000000000001
54 000000000000000000000000000000000000000000000000000001
55 0000000000000000000000000000000000000000000000000000001
56 00000000000000000000000000000000000000000000000000000001
57 000000000000000000000000000000000000000000000000000000001
58 0000000000000000000000000000000000000000000000000000000001
59 00000000000000000000000000000000000000000000000000000000001
60 000000000000000000000000000000000000000000000000000000000001
61 1111111110000000000000000000000000000000000000000000000000000
62 11111111110000000000000000000000000000000000000000000000000000
63 011111111110000000000000000000000000000000000000000000000000000
64 0011111111110000000000000000000000000000000000000000000000000000