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 A123240 #7 Mar 18 2023 13:51:31 %S A123240 6,8,10,12,14,15,18,20,21,22,26,27,28,32,33,34,35,36,38,39,44,45,46, %T A123240 48,50,51,52,55,57,58,60,62,63,64,65,68,69,72,74,75,76,77,80,82,84,85, %U A123240 86,87,90,91,92,93,94,95,96,98,99,100,106,108,111,112,115,116,117,118,119,120,122,123,124,125,126,129,132,133,134,140,141,142,143,144,145,146,147,148,150,153,155,156,158,159,160,161,162,164,166,168,171,172,175,176,177,178,180,183,185,187,188,192,194,196,198,200,201,202,203,204 %N A123240 Natural numbers with number of divisors not equal to a Fibonacci number. %C A123240 No prime or square of a prime or square of a prime's square is included in this sequence. [From Avik Roy (avik_3.1416(AT)yahoo.co.in), Jan 23 2009] %H A123240 T. D. Noe, <a href="/A123240/b123240.txt">Table of n, a(n) for n=1..10000</a> %t A123240 If[MemberQ[Fibonacci[Range[20]],DivisorSigma[0,#]],Nothing,#]&/@Range[250] (* _Harvey P. Dale_, Mar 18 2023 *) %Y A123240 Complement of A123193. Different from A000379 (e.g. contains 180). %K A123240 easy,nonn %O A123240 1,1 %A A123240 _Giovanni Teofilatto_, Oct 07 2006