%I #17 May 05 2024 19:21:53
%S 20,24,27,28,32,52,55,74,77,85,87,91,93,97,115,123,143,146,149,157,
%T 161,163,178,187,197,209,211,214,215,221,223,239,242,249,262,269,283,
%U 287,307,311,313,321,334,349,379,391,393,409,421,453,487,493,499,523,581,586,617,641,647,677,691,707,709,787,794,811,823,839,853,859,887,907,913,929,941,953,1031,1049,1063,1093,1229
%N Indices of Fibonacci numbers with 4 distinct prime factors.
%H Amiram Eldar, <a href="/A114843/b114843.txt">Table of n, a(n) for n = 1..88</a>
%H Blair Kelly, <a href="http://mersennus.net/fibonacci/">Fibonacci and Lucas Factorizations</a>.
%e a(1)=20 because the 20th Fibonacci number consists of 4 distinct prime factors (i.e., 6765 = 3 x 5 x 11 x 41).
%o (PARI) n=1;while(n<350,if(omega(fibonacci(n))==4,print1(n,", "));n++)
%Y Cf. A114823-A114826, A114836-A114841.
%Y Column k=4 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(56)-a(81) from _Max Alekseyev_, Aug 18 2013