User blog comment:Deedlit11/Bignum Bakeoff appetizer/@comment-5529393-20140916022609/@comment-24061664-20140916103916

Changing to i=-1, it was like this

from b = 1

k =    2   ==> b =     3 k =    4   ==> b =     5 k =    8   ==> b =     9 k =   16   ==> b =    17 k =   32   ==> b =    33 k =   64   ==> b =    65 k =  128   ==> b =   129 k =  256   ==> b =   257 k =  512   ==> b =   513 k = 1024   ==> b =  1025 k = 2048   ==> b =  2049 k = 4096   ==> b =  4097 k = 8192   ==> b =  8193 k = 16384  ==> b = 16385 k = 32768  ==> b = 32769

from b = 10

k =    2   ==> b =    11 k =    4   ==> b =    13 k =    8   ==> b =    17 k =   16   ==> b =    25 k =   32   ==> b =    41 k =   64   ==> b =    73 k =  128   ==> b =   137 k =  256   ==> b =   265 k =  512   ==> b =   521 k = 1024   ==> b =  1033 k = 2048   ==> b =  2057 k = 4096   ==> b =  4105 k = 8192   ==> b =  8201 k = 16384  ==> b = 16393