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Numbers n such that A067824(n) = n.
6

%I #8 Aug 31 2019 15:33:10

%S 1,2,4,6,8,16,32,40,64,128,224,256,264,512,1024,2048,4096,5632,8192,

%T 16384,26624,32768,65536,72192,131072,154752,262144,524288,557056,

%U 1048576,2072576,2097152,2490368,4194304,5537792,8388608,10518528,16777216,33554432,48234496

%N Numbers n such that A067824(n) = n.

%H Amiram Eldar, <a href="/A122408/b122408.txt">Table of n, a(n) for n = 1..100</a>

%F A002033(a(n)) = A074206(a(n)) = a(n)/2.

%F A067824(a(n)) = a(n).

%e m=40, the proper divisors of 40 are 1, 2, 4, 5, 8, 10 and 20:

%e A067824(40) = 1+Sum(A067824(d): 1<=d<40) = 1+(1+2+4+2+8+6+16) = 40, therefore 40 is a term.

%Y A000079 is a subsequence.

%Y Cf. A002033, A067824, A074206, A163272.

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Sep 03 2006

%E More terms from _Amiram Eldar_, Aug 31 2019