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 A072500 #8 Aug 28 2025 04:02:51
%S A072500 1,2,3,8,5,18,7,32,27,50,11,288,13,98,75,512,17,972,19,1000,147,242,
%T A072500 23,13824,125,338,243,2744,29,27000,31,4096,363,578,245,419904,37,722,
%U A072500 507,64000,41,86436,43,10648,6075,1058,47,1769472,343,12500,867,17576,53
%N A072500 Product of divisors of n which are >= n^(1/2).
%C A072500 a(n) = n iff n is not a composite number.
%H A072500 Harvey P. Dale, <a href="/A072500/b072500.txt">Table of n, a(n) for n = 1..1000</a>
%e A072500 The divisors of 20 are 1, 2, 4, 5, 10 and 20. a(20) = 5*10*20 = 1000.
%t A072500 Table[Times @@ Select[Divisors[n], # >= Sqrt[n] &], {n, 1, 55}]
%Y A072500 Cf. A072499, A072501, A070038.
%K A072500 nonn,changed
%O A072500 1,2
%A A072500 _Amarnath Murthy_, Jul 20 2002
%E A072500 Edited by _Robert G. Wilson v_, Jul 22 2002
%E A072500 Corrected a(16) by _Harvey P. Dale_, Oct 06 2011