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 A189554 #8 Mar 30 2012 17:22:58 %S A189554 35,57,65,93,117,125,145,177,189,205,207,209,217,219,237,245,261,289, %T A189554 303,305,323,325,345,377,387,393,413,415,427,429,453,473,477,485,497, %U A189554 513,515,517,529,531,533,537,553,561,597,605,625,629,639,657,665,681 %N A189554 Composite numbers n such that x' = n has no integer solution, where x' is the arithmetic derivative (A003415) of x. %C A189554 These are the composite terms of A098700. The prime terms of A098700 are in A189483. Apparently all terms are odd. %D A189554 See A003415. %H A189554 T. D. Noe, <a href="/A189554/b189554.txt">Table of n, a(n) for n = 1..1000</a> %F A189554 Composite k such that A099302(k) = 0. %Y A189554 Cf. A003415, A098700, A099302, A189483. %K A189554 nonn %O A189554 1,1 %A A189554 _T. D. Noe_, Apr 24 2011