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 A337813 #6 Sep 25 2020 00:00:48 %S A337813 4,8,10,12,16,20,22,24,28,30,32,36,39,40,43,44,45,48,50,52,55,56,58, %T A337813 60,63,64,66,68,70,72,75,76,79,80,84,87,88,90,92,94,96,99,100,102,104, %U A337813 106,108,110,112,116,117,119,120,124,126,128,132,135,136,140,144 %N A337813 Numbers k such that the number of distinct prime factors of 2^k - 1 is greater than the corresponding count for 2^k + 1. %o A337813 (PARI) for(n=1,150,if(omega(2^n-1)>omega(2^n+1),print1(n,", "))) %Y A337813 Cf. A046799, A046800, A067886, A337810, A337811, A337812. %K A337813 nonn %O A337813 1,1 %A A337813 _Hugo Pfoertner_, Sep 23 2020