=={{header|Ruby}}==
It finds the number from the position ( the coordinates ).
{{trans|Python}}
<lang ruby>require 'prime'
===Another Version===
computes the next spiral position.
<lang ruby>require 'prime'
h = Hash.new(0)
position = spiral_generator
(start ... start+n*n-1).each do |i|
pos = position.next
h[pos] = 1 if i.prime?
chr = [[' ', '▄'], ['▀', '█']]
(xmin, xmax), (ymin, ymax) = h.keys.transpose.map(&:first).minmax)
ymin, ymax = h.keys.map(&:last).minmax
(xmin..xmax).step(2).each do |x|
puts (ymin..ymax).map{|y| chr[h[[x,y]]][h[[x+1,y]]]}.join
end
[911, 120122].each do |n|
puts "\nN : #{n}"
ulam_spiral(n)
{{out}}
<pre style="font-size:50%">
N : 911
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N : 120122
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▀ ▄ ▀▄ ▄ ▄▀▄ ▄ ▀▄▀▄ ▀ ▀ ▄ ▄ ▄▀ ▄▀▄ ▀▄ ▀▄
</pre>
The method of presentation of the result consulted " REXX ".
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