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 A181807 #19 Feb 16 2025 08:33:13 %S A181807 1,2,3,5,6,7,8,10,11,14,19,20,21,22,23,24,25,28,31,32,33,35,38,39,41, %T A181807 48,49,52,53,57,59,65,67,69,77,81,82,86,91,94,103,105,107,114,118,122, %U A181807 125,131,132,135,141,142,144,145,154,157,160,163,166,171,175,180 %N A181807 Number of divisors of A181806(n) that are highly composite (A002182). %C A181807 Also, length of row A181806(n) in triangles A181802 and A181803. %H A181807 David A. Corneth, <a href="/A181807/b181807.txt">Table of n, a(n) for n = 1..153</a> %H A181807 A. Flammenkamp, <a href="http://wwwhomes.uni-bielefeld.de/achim/highly.txt">List of the first 1200 highly composite numbers</a> %H A181807 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HighlyCompositeNumber.html">Highly composite number</a> %F A181807 a(n) = A181801(A181806(n)). %e A181807 A181806(4) = 12 has exactly five divisors (namely, 1, 2, 4, 6 and 12) that are members of A002182. Hence, a(4) = 5. %Y A181807 Cf. A002182, A181801, A181802, A181803, A181806. %K A181807 nonn %O A181807 1,2 %A A181807 _Matthew Vandermast_, Nov 27 2010 %E A181807 More terms from _Amiram Eldar_, Aug 29 2019 (calculated from the b-file at A181806)