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 A070761 #10 Feb 16 2025 08:32:46 %S A070761 4,9,42,56,74,99,133,177,236,315,420,560,747,996,1328,1771,2362,3149, %T A070761 4199,5599,7466,9954,13273,17697,23596,31462,41950,74577,99437,132583, %U A070761 235703,314271,419028,558704,744938,993251,1324335,1765780,2354374 %N A070761 Values of floor((4/3)^n) that are composite. %D A070761 R. K. Guy, Unsolved Problems in Number Theory, E19 %H A070761 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PowerFloors.html">Power Floors</a> %t A070761 Select[Rest[Union[Floor[(4/3)^Range[80]]]],!PrimeQ[#]&] (* _Harvey P. Dale_, Sep 23 2011 *) %Y A070761 Cf. A046038, A067905, A070762. %K A070761 nonn %O A070761 1,1 %A A070761 _Eric W. Weisstein_, May 04 2002