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%I #8 Jun 07 2021 06:49:29
%S 4,6,8,12,16,24,27,28,32,42,48,54,60,64,96,108,112,120,126,128,150,
%T 168,176,192,204,216,240,243,250,256,294,312,378,384,396,432,440,448,
%U 456,460,480,486,496,500,504,512,540,588,672,700,768,774,828,840,864,888,924,960,972,1000,1014,1024,1080,1134,1176,1216
%N Numbers k such that A173557(k) divides nonzero A051709(k).
%o (PARI)
%o A051709(n) = ((sigma(n) + eulerphi(n)) - (2*n));
%o A173557(n) = factorback(apply(p -> p-1, factor(n)[, 1]));
%o isA344994(n) = { my(u=A051709(n)); ((u>0)&&(0==(u%A173557(n)))); };
%Y Cf. A051709, A173557.
%Y Cf. A344995, A345054 (subsequences).
%Y Cf. also A344754, A345051.
%K nonn
%O 1,1
%A _Antti Karttunen_, Jun 05 2021
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