This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A114842 #21 Oct 14 2019 06:54:07 %S A114842 8,9,10,12,14,19,22,25,26,31,34,41,53,59,61,71,73,79,89,94,101,107, %T A114842 109,113,121,127,151,167,173,191,193,199,227,251,271,277,293,331,353, %U A114842 397,401,467,587,599,601,613,631,653,743,991,1091,1223,1373 %N A114842 Indices of Fibonacci numbers with 2 distinct prime factors. %C A114842 A072381 is subsequence, since the only square Fibonacci numbers are 1 and 144 which are not squares of primes. - _Charles R Greathouse IV_, Sep 24 2012 %H A114842 Yann Bugeaud, Florian Luca, Maurice Mignotte, and Samir Siksek, <a href="https://doi.org/10.3792/pjaa.81.17">On Fibonacci numbers with few prime divisors</a>, Proc. Japan Acad. Ser. A Math. Sci., Volume 81, Number 2 (2005), 17-20. %e A114842 a(1) = 8 because 8th Fibonacci number consists of 2 distinct prime factors (i.e. 21 = 3*7). %e A114842 25 is in the sequence because Fibonacci(25) = 75025 = 5^2 * 3001 consists of 2 distinct prime factors. %o A114842 (PARI) n=1;while(n<355,if(omega(fibonacci(n))==2,print1(n,", "));n++) %Y A114842 Cf. A114823-A114826, A114836-A114841. %Y A114842 Column k=2 of A303217. %K A114842 hard,more,nonn %O A114842 1,1 %A A114842 _Shyam Sunder Gupta_, Feb 19 2006 %E A114842 a(40)-a(50) from _Donovan Johnson_, Sep 27 2008 %E A114842 a(51)-a(52) from _Max Alekseyev_, Aug 18 2013 %E A114842 a(53) from _Amiram Eldar_, Oct 14 2019