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 A139227 Array read by rows: row n lists the proper divisors of n-th Fibonacci number A000045(n). 0

%I

%S 1,1,1,1,2,4,1,1,3,7,1,2,17,1,5,11,1,1,2,3,4,6,8,9,12,16,18,24,36,48,

%T 72,1,1,13,29,1,2,5,10,61,122,305,1,3,7,21,47,141,329,1,1,2,4,8,17,19,

%U 34,38,68,76,136,152,323,646,1292

%N Array read by rows: row n lists the proper divisors of n-th Fibonacci number A000045(n).

%e Row ....... Array begins

%e ===========================================================

%e 3 ......... 1

%e 4 ......... 1

%e 5 ......... 1

%e 6 ......... 1, 2, 4

%e 7 ......... 1

%e 8 ......... 1, 3, 7

%e 9 ......... 1, 2, 17

%e 10 ........ 1, 5, 11

%e 11 ........ 1

%e 12 ........ 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72

%e 13 ........ 1

%t f[n_] := Most@ Divisors@ Fibonacci@ n; Flatten@ Array[f, 16, 3] (* _Robert G. Wilson v_ *)

%Y Cf. A000045, A133021, A139044, A139045.

%K easy,nonn,tabl

%O 3,5

%A _Omar E. Pol_, Apr 28 2008

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Last modified June 20 09:57 EDT 2021. Contains 345162 sequences. (Running on oeis4.)