Periodic Strings

[Antoni Gual]

Antoni states:
Starting point=11606
Period=8689

String fragment at 11606:
33333333312526283231323025211925273434394037374037343839404136383836414239403329353836424338413533333

String fragment at 20295 (11606+8689):
33333333327302730273125302326242728364036394237374443374238384140333430211926283133373637364140343227

These do not match.

Obviously my way of finding repeats is not at fault. both strings start by 9 threes, so the next values should be equal. As they aren't, it is my way of generating the series what is at fault. One of both series of nine threes must be incorrect....

Quibbler: strings are not slow, provided you never resize the big ones... Try it!!