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 A177247 #5 Aug 26 2023 19:11:43 %S A177247 1,1,2,3,5,8,13,21,34,55,89,144,233,377,987,1597,2584,4181,17711, %T A177247 75025,121393,317811,514229,832040,2178309,3524578,5702887,14930352, %U A177247 24157817,102334155,433494437,701408733,1134903170,2971215073,7778742049 %N A177247 Fibonacci numbers Fib(n) whose decimal expansion does not contain any digit 6. %C A177247 Probability that Fib(n) contains no 6's goes to zero as n grows to infinity. I suppose the maximum number is F(258) having 54 digits with no 6's. %e A177247 a(7)=13 since it is the 7th Fibonacci having no 6's %t A177247 Select[Fibonacci[Range[100]],DigitCount[#,10,6]==0&] (* _Harvey P. Dale_, Aug 26 2023 *) %Y A177247 Cf. A000045, A177194, A177195, A177231, A177245, A177246, A176253 %K A177247 nonn,base %O A177247 1,3 %A A177247 _Carmine Suriano_, May 06 2010