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 A070173 #15 Jun 08 2022 03:20:09 %S A070173 1,2,4,8,12,16,24,32,40,48,56,64,72,80,88,96,104,112,128,136,144,152, %T A070173 160,176,184,192,200,208,224,232,248,256,272,288,304,320,352,368,384, %U A070173 400,416,448,464,480,496,512,544,576,592,608,640,656,688,704,752,768 %N A070173 Numbers k such that k! and 2^k+1 are relatively prime. %H A070173 Amiram Eldar, <a href="/A070173/b070173.txt">Table of n, a(n) for n = 1..3000</a> %t A070173 Select[Range[1000],CoprimeQ[#!,2^#+1]&] %o A070173 (PARI) for(n=1,1255,if(gcd(n!,2^n+1)==1,print1(n,","))) %Y A070173 Cf. A000051, A000142, A069180. %K A070173 easy,nonn %O A070173 1,2 %A A070173 _Benoit Cloitre_, May 06 2002