Miscellany

def pi  q, r, t, k = 1, 0, 1, 1  loop do    n = (3*q+r) / t    if (4*q+r) / t == n then      yield n      q, r, t, k = 10*q, 10*(r-n*t), t, k    else      q, r, t, k = q*k, q*(4*k+2)+r*(2*k+1), t*(2*k+1), k+1    end  endendbuff = []pi { |n|	buff.push(n)	if (buff.length() == 10)		sum = 0		for i in buff			sum = sum + i		end		if sum == 13			print "#{buff}\n"			exit		end		buff.shift()	end	$stdout.flush}