In doing the calculation on an Excel spreadsheet using a model based on females born (since they're the important child-bearing ones), starting with 35 women, assuming they had 18 daughters in 1728, 18 more after 2 years, etc, so that there were a total of 90 females in the second generation over 10 years. After another 10 years elapsed, the first 18 daughters would be 20 years old and had 9 daughters, after 2 years it begins ramping up slowly as more daughters came of age. So although your total numbers are correct for each successive generation, your assumption that they would have a litter of 5 as soon as they turn 20 years, isn't a good basis as we get closer to the Exodus in 1513. By then the births to that date for the last three generations would be about 135,759; 99,741; and 545.
- So by 1513, I have a generations combined total of 327,572 females. If we double that, it's only 655,144 total.
If we assume that they lived all the way to 100 yrs, it would be 320,890 living females.
Now for the scary part, 102,861 of those females would be under the age of 10. Nearly a third of the total is under 10. Nearly 50,000 are under 3, almost 26,000 not old enough to walk. Since this is just the girls, multiply those numbers by 2. Now imagine going camping with all those kids.
Perhaps the biggest problem with this scenario is that doesn't fit with any recorded chronology of the Bible. This fits 10 generations into the 215 years of Egyptian captivity. However, when you look at the geneology of Jesus in Matthew, there are 10 generations from Judah, before the captivity all the way down to David in 1107 BCE. That has 10 generations spanning 600 years (Boaz musta been reallllly old!) Most of the similarly recorded geneologies show low and slow growth. And in that era, it would be a lot of work taking care of children, even if it was only 5 spaced 2 years apart. Maybe the pyramids are actually stuffed with diapers rather than being stone all the way through.
Edit to add: Watchtower figures the Egyptian captivity from 1728 BCE to 1513, a total of 215 years. (SI p. 294)
The captivity was supposedly only 215 years.....but number of years in Egypt is supposed to be 350 (Kothath to Amram to Moses). i.e. the captivity didn't actually start until long after the first Israelites had come into Egypt and began their mass breeding. So.....don't we need to base our calculations on the supposed 350 years in lieu of the 215 of just captivity?