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 A342481 #14 May 09 2021 10:20:45 %S A342481 17,257,337,577,593,769,1297,1361,1553,1601,1873,4177,4673,5393,5441, %T A342481 5953,16657,17489,17681,17729,17921,18257,20753,21313,21521,21569, %U A342481 21841,22273,32833,33601,33617,33809,33857,34129,34369,36929,37201,37441,37633,37649,37889,38737 %N A342481 Prime numbers whose binary expansion involves powers of 2 with only composite (or zero) exponents. %e A342481 17 = 2^4 + 2^0 is a term. %e A342481 337 = 2^8 + 2^6 + +2^4 + 2^0 is a term. %Y A342481 Cf. A342475. %K A342481 nonn,base %O A342481 1,1 %A A342481 _Vassilis Papadimitriou_, Mar 13 2021