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%I #6 Jun 01 2024 12:05:14
%S 9,16,20,21,25,33,49,52,57,65,68,69,77,85,93,108,116,121,129,133,135,
%T 141,145,148,161,164,169,177,185,192,201,205,209,212,213,217,221,237,
%U 240,244,249,252,253,265,289,292,300,301,305,309,315,321,329,341,351,356,361,365,375,377,381,388,393,396,404,413,417
%N Numbers k such that k' / gcd(k,k') is of the form 4m+2, where k' stands for the arithmetic derivative of k, A003415.
%H Antti Karttunen, <a href="/A373265/b373265.txt">Table of n, a(n) for n = 1..10000</a>
%o (PARI) isA373265 = A373264;
%Y Setwise difference A369002 \ A369005.
%Y Cf. A003415, A083345, A373264 (characteristic function).
%K nonn
%O 1,1
%A _Antti Karttunen_, Jun 01 2024
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