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 A282191 #12 Sep 08 2022 08:46:18 %S A282191 5973,22605,28251,42663,47697,50481,50643,52353,58527,63897,71757, %T A282191 76197,86049,92289,92523,93675,94635,96891,104457,105087,105723, %U A282191 112875,117873,118731,121827,122883,129417,131289,137295,138777,141195,141825,142857,143433 %N A282191 Odd numbers divisible by 3 which are neither of the form p + 3^m + 1 nor of the form p + 3^m - 1 with p prime. %C A282191 Numbers whose distance to both nearest neighbor numbers in A282430 is 1. %o A282191 (Magma) lst:=[]; for n in [3..143433 by 6] do c:=0; e:=Floor(Log(3, n)); m:=0; while m le e do a:=n-3^m; if IsPrime(a+1) or IsPrime(a-1) then break; end if; c+:=1; m+:=1; end while; if c eq e+1 then Append(~lst, n); end if; end for; lst; %Y A282191 Cf. A282430. %K A282191 nonn %O A282191 1,1 %A A282191 _Arkadiusz Wesolowski_, Feb 15 2017