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A133021 Irregular triangle read by rows: row n lists divisors of n-th Fibonacci number A000045(n).

%I A133021 #19 Nov 15 2024 12:56:06
%S A133021 1,1,1,2,1,3,1,5,1,2,4,8,1,13,1,3,7,21,1,2,17,34,1,5,11,55,1,89,1,2,3,
%T A133021 4,6,8,9,12,16,18,24,36,48,72,144,1,233,1,13,29,377,1,2,5,10,61,122,
%U A133021 305,610,1,3,7,21,47,141,329,987,1,1597
%N A133021 Irregular triangle read by rows: row n lists divisors of n-th Fibonacci number A000045(n).
%H A133021 T. D. Noe, <a href="/A133021/b133021.txt">Rows n = 1..100 of irregular triangle, flattened</a>
%e A133021 Triangle begins:
%e A133021     [ 1 ],
%e A133021     [ 1 ],
%e A133021     [ 1, 2 ],
%e A133021     [ 1, 3 ],
%e A133021     [ 1, 5 ],
%e A133021     [ 1, 2, 4, 8 ],
%e A133021     [ 1, 13 ],
%e A133021     [ 1, 3, 7, 21 ],
%e A133021     [ 1, 2, 17, 34 ],
%e A133021     [ 1, 5, 11, 55 ],
%e A133021     [ 1, 89 ],
%t A133021 Flatten[Table[Divisors[Fibonacci[n]], {n, 20}]] (* _T. D. Noe_, Mar 14 2014 *)
%o A133021 (Magma) /* As triangle */ [Divisors(Fibonacci(n)): n in [1..30]]; // _Vincenzo Librandi_, Nov 15 2024
%Y A133021 Cf. A000045 (Fibonacci numbers), A027750, A063375 (row lengths).
%K A133021 nonn,tabf,look
%O A133021 1,4
%A A133021 _Omar E. Pol_, Oct 26 2007