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 A173340 #22 Sep 08 2022 08:45:50 %S A173340 1,2,6,8,12,18,20,24,30,36,40,42,45,48,56,60,70,72,80,84,90,96,105, %T A173340 108,112,120,126,128,132,140,144,150,160,162,168,180,192,198,200,210, %U A173340 216,220,224,240,252,264,270,280,288,300,308,312,315,320,324,330,336,350,352,360,378,384,390,396,400,405,420,432,440 %N A173340 Numbers n for which the factorial of the number of divisors of n is divisible by n. %C A173340 An odd prime p can't be in this sequence because it only has two divisors and 2! does not divide p. %H A173340 Amiram Eldar, <a href="/A173340/b173340.txt">Table of n, a(n) for n = 1..10000</a> %t A173340 Select[Range[1000], Mod[DivisorSigma[0,#]!, #] == 0 &] %o A173340 (Magma) [ n: n in [1..1000] | Factorial(#Divisors(n)) mod n eq 0 ]; %Y A173340 Cf. A000005, A000142, A130674. %K A173340 nonn %O A173340 1,2 %A A173340 _Robert Wintner_, Nov 22 2010