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 A154894 #8 Nov 19 2019 03:35:19 %S A154894 8,21,34,55,377,610,987,4181,10946,17711,46368,75025,121393,1346269, %T A154894 3524578,5702887,9227465,24157817,39088169,63245986,165580141, %U A154894 701408733,1134903170,1836311903,7778742049,12586269025,20365011074,53316291173 %N A154894 Fibonacci numbers whose number of proper divisors is prime. %H A154894 Amiram Eldar, <a href="/A154894/b154894.txt">Table of n, a(n) for n = 1..494</a> %e A154894 8 is member because the number of proper divisors of 8 is 3, a prime number. %t A154894 Fibonacci[Select[Range[60], PrimeQ[DivisorSigma[0, Fibonacci[ # ]] - 1] &]] (* _Stefan Steinerberger_, Jan 31 2009 *) %Y A154894 Cf. A000045, A152744. %K A154894 nonn %O A154894 1,1 %A A154894 _Omar E. Pol_, Jan 25 2009 %E A154894 More terms from _Stefan Steinerberger_, Jan 31 2009