RosettaCodeData/Task/Hofstadter-Q-sequence/Lua/hofstadter-q-sequence.lua

29 lines
596 B
Lua

function hofstadter (limit)
local Q = {1, 1}
for n = 3, limit do
Q[n] = Q[n - Q[n - 1]] + Q[n - Q[n - 2]]
end
return Q
end
function countDescents (t)
local count = 0
for i = 2, #t do
if t[i] < t[i - 1] then
count = count + 1
end
end
return count
end
local noError, hofSeq = pcall(hofstadter, 1e5)
if noError == false then
print("The sequence could not be calculated up to the specified limit.")
os.exit()
end
for i = 1, 10 do
io.write(hofSeq[i] .. " ")
end
print("\n" .. hofSeq[1000])
print(countDescents(hofSeq))