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

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, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144, 1, 233, 1, 13, 29, 377, 1, 2, 5, 10, 61, 122, 305, 610, 1, 3, 7, 21, 47, 141, 329, 987, 1, 1597

Offset

1,4

Links

T. D. Noe, Rows n = 1..100 of irregular triangle, flattened

Example

Triangle begins:
    [ 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 ],

Mathematica

Flatten[Table[Divisors[Fibonacci[n]], {n, 20}]] (* T. D. Noe, Mar 14 2014 *)

Prog

(Magma) /* As triangle */ [Divisors(Fibonacci(n)): n in [1..30]]; // Vincenzo Librandi, Nov 15 2024

Crossrefs

Cf. A000045 (Fibonacci numbers), A027750, A063375 (row lengths).

Sequence in context: A117365 A116212 A079068 * A131208 A353467 A168008

Adjacent sequences: A133018 A133019 A133020 * A133022 A133023 A133024

Keyword

nonn,tabf,look

Author

Omar E. Pol, Oct 26 2007

Status

approved