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 A109730 #13 Apr 03 2024 05:04:54 %S A109730 40,54,102,138,222,364,366,474,532,642,834,1036,1146,1372,1504,1876, %T A109730 1986,2994,3052,3556,4396,4564,5514,5572,5622,6198,6412,6522,7026, %U A109730 7912,7924,8202,8596,8706,9424,9714,10444,10722,11226,11406,12066,12964 %N A109730 Lesser of twin admirable numbers: k such that k and k+2 are both admirable numbers. %C A109730 Conjecture: Sequence is infinite. %H A109730 Amiram Eldar, <a href="/A109730/b109730.txt">Table of n, a(n) for n = 1..10000</a> %t A109730 Select[Range[13000], MemberQ[Most[Divisors[#]], (DivisorSigma[1,#]-2*#)/2] && MemberQ[Most[Divisors[#+2]], (DivisorSigma[1,#+2]-2*(#+2))/2]&] (* _James C. McMahon_, Mar 29 2024 *) %Y A109730 Cf. A111592. %K A109730 nonn %O A109730 1,1 %A A109730 _Jason Earls_, Aug 09 2005