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 A177246 #13 Dec 13 2018 19:06:36 %S A177246 1,1,2,3,5,8,13,21,55,89,233,377,610,987,1597,6765,17711,28657,75025, %T A177246 121393,317811,2178309,5702887,39088169,1836311903,2971215073, %U A177246 12586269025,32951280099,53316291173,86267571272,591286729879 %N A177246 Fibonacci numbers whose decimal expansion does not contain any digit 4. %C A177246 Probability that Fib(n) contains no 4's goes to zero as n grows to infinity. I suppose that the maximum number is Fib(114) having 24 digits, none of them being a "4". %H A177246 Robert Israel, <a href="/A177246/b177246.txt">Table of n, a(n) for n = 1..41</a> (conjectured to be complete) %e A177246 a(9)=55 is the 9th Fibonacci having no digit 4's. %p A177246 remove(t -> has(convert(t,base,10),4), map(combinat:-fibonacci, [$1..1000])); # _Robert Israel_, Dec 13 2018 %t A177246 Select[Fibonacci@Range@114, !MemberQ[IntegerDigits[#], 4] &] (* _Amiram Eldar_, Dec 13 2018 *) %Y A177246 Cf. A000045, A177194, A177195, A177231, A177245, A176253. %K A177246 nonn,base %O A177246 1,3 %A A177246 _Carmine Suriano_, May 06 2010