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A114836 Indices of Fibonacci numbers with 9 distinct prime factors. 13

%I #11 Oct 14 2019 06:53:37

%S 80,84,88,96,100,108,132,138,156,184,189,196,222,232,243,248,250,255,

%T 268,272,273,284,286,295,318,325,328,333,357,370,402,406,412,418,426,

%U 435,477,498,534,539,556,559,561,591,602,603,604,628,629,637,639,678

%N Indices of Fibonacci numbers with 9 distinct prime factors.

%H Amiram Eldar, <a href="/A114836/b114836.txt">Table of n, a(n) for n = 1..94</a>

%H Blair Kelly, <a href="http://mersennus.net/fibonacci/">Fibonacci and Lucas Factorizations</a>.

%e a(1)=80 because 80th fibonacci number(i.e. 23416728348467685) consists of 9 distinct prime factors (i.e. 3 x 5 x 7 x 11 x 41 x 47 x 1601 x 2161 x 3041

%e )

%o (PARI) n=1;while(n<335,if(omega(fibonacci(n))==9,print1(n,", "));n++)

%Y Column k=9 of A303217.

%K nonn

%O 1,1

%A _Shyam Sunder Gupta_, Feb 19 2006

%E More terms from _Ryan Propper_, Apr 26 2006

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Last modified April 25 11:39 EDT 2024. Contains 371969 sequences. (Running on oeis4.)