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A114837 Indices of Fibonacci numbers with 8 distinct prime factors. 3

%I #14 Oct 14 2019 06:53:44

%S 60,72,110,112,114,128,130,135,147,154,170,171,174,217,225,231,236,

%T 238,275,279,282,290,309,316,338,355,366,374,425,436,442,452,471,481,

%U 524,538,548,553,575,642,649,694,796,801,818,833,838,847,849,851,886,889,922,923,926,939,949,958,963,965,971,979,1037,1041,1077,1079,1094,1111,1127,1137,1141,1153,1154,1189,1211

%N Indices of Fibonacci numbers with 8 distinct prime factors.

%H Amiram Eldar, <a href="/A114837/b114837.txt">Table of n, a(n) for n = 1..87</a>

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

%e a(1)=60 because 60th fibonacci number consists of 8 distinct prime factors (i.e. 1548008755920 = 2^4 x 3^2 x 5 x 11 x 31 x 41 x 61 x 2521)

%o (PARI) n=1;while(n<370,if(omega(fibonacci(n))==8,print1(n,", "));n++)

%Y Cf. A114823-A114826, A114836-A114841.

%Y Column k=8 of A303217.

%K nonn

%O 1,1

%A _Shyam Sunder Gupta_, Feb 19 2006

%E More terms from _Ryan Propper_, Apr 26 2006

%E a(53)-a(75) from _Max Alekseyev_, Aug 18 2013

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Last modified April 23 11:35 EDT 2024. Contains 371912 sequences. (Running on oeis4.)