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 A173347 #8 Apr 20 2021 06:59:39 %S A173347 21,233,196418,9227465,165580141,2971215073,53316291173,2504730781961, %T A173347 3416454622906707,51680708854858323072,184551825793033096366333, %U A173347 898923707008479989274290850145,3210056809456107725247980776292056 %N A173347 Fibonacci numbers with both a prime number of 0's and a prime number of 1's in their binary representations. %C A173347 21 -> 10101, 233 -> 11101001, 196418 -> 101111111101000010,.. %t A173347 Select[Fibonacci[Range[6! ]],PrimeQ[DigitCount[ #,2,0]]&&PrimeQ[DigitCount[ #,2,1]]&] %Y A173347 Cf. A000045, A144214. %K A173347 base,nonn %O A173347 1,1 %A A173347 _Vladimir Joseph Stephan Orlovsky_, Feb 16 2010