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You wanted to enter the substring coordinates in the n,m format. Try this small adaption of Don Cragun's suggestion:
for ((i=1 ; i <= $2; i++))
do echo "Enter starting digit and length of $i...

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In the standards, a variable name (but, obviously, not a positional parameter) in expression in:
$((expression))
can be presented with or without a leading <dollar-sign> character to get the value...

Assuming you're using a shell that recognizes arrays, the following seems to avoid your syntax and logic errors:
#Initialize arrays
for ((i=1 ; i <= $2; i++))
do echo "Enter starting digit of $i...