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  1. def unfold(f, x):
  2. 	while x is not None:
  3. 		yield x
  4. 		x = f(x)
  5.  
  6. def next_elem(t):
  7. 	(a, b, c, d) = t
  8. 	return (b, c, d, a*(a+1))
  9.  
  10. logical = unfold(next_elem, (4, 5, 6, 8))
  11.  
  12. for n in logical:
  13. 	print(n)
  14. 	if n[-1] > 1000:
  15. 		break
Success #stdin #stdout 0.11s 14120KB
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Standard input is empty
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(4, 5, 6, 8)
(5, 6, 8, 20)
(6, 8, 20, 30)
(8, 20, 30, 42)
(20, 30, 42, 72)
(30, 42, 72, 420)
(42, 72, 420, 930)
(72, 420, 930, 1806)
https://ideone.com/6VEfu4
language:
Python 3 (python  3.12)
created:
10 days ago
visibility:
public

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