giles da96a79104
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ocaml: phase 5.1 abundant.ml baseline (count abundant numbers < 100 = 21) ...
A number n is abundant if its proper-divisor sum exceeds n. Reuses
the trial-division div_sum helper:
let count_abundant n =
let c = ref 0 in
for i = 12 to n - 1 do
if div_sum i > i then c := !c + 1
done;
!c
count_abundant 100 = 21
Abundant numbers under 100, starting at 12, 18, 20, 24, 30, 36, 40,
42, 48, 54, 56, 60, 66, 70, 72, 78, 80, 84, 88, 90, 96 -> 21.
Companion to euler21_small.ml (amicable). The classification:
perfect: d(n) = n (e.g. 6, 28)
abundant: d(n) > n (e.g. 12, 18)
deficient:d(n) < n (everything else)
124 baseline programs total.
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giles
da96a79104