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codyrioux/prime.erl

Created December 29, 2011 20:52
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Naive Prime Sieve
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prime.erl
-module(prime).
-export([start/1]).
start(Max) -> io:format("Solution: ~p ~n", [sieve(lists:seq(2, Max), Max)]).
sieve([H|T], Max) -> if H * H > Max -> [H] ++ T; true -> [H] ++ sieve(mark(H, T), Max) end.
mark(X, List) -> lists:filter(fun(Y) -> (Y rem X =/= 0) end, List).
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