login
Numbers n for which A019565(n) <= A087207(n) < n.
4

%I #10 Jun 20 2017 23:11:35

%S 65,513,1026,4107,8200,8256,16400,16450,16512,16544,16641,32800,32900,

%T 33024,33282,33920,49184,65600,65800,66048,66080,131200,131334,132096,

%U 132160,163968,262400,262668,264192,264320,274432,327936,524342,524610,524800,524832,525826,528384,532500,540736,548864,655872,786467,1048617

%N Numbers n for which A019565(n) <= A087207(n) < n.

%C Any 2-cycle of A087207 and also any 2-cycle of A019565 (in which case A019565(x) = A087207(x) for both members of the cycle), if such cycles exist at all, must have the larger one of its members included in this sequence.

%H Antti Karttunen, <a href="/A286612/b286612.txt">Table of n, a(n) for n = 1..97</a>

%H <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a>

%H <a href="/index/Pri#prime_indices">Index entries for sequences computed from indices in prime factorization</a>

%o (Scheme, with _Antti Karttunen_'s IntSeq-library)

%o (define A286612 (MATCHING-POS 1 1 (lambda (n) (and (< (A087207 n) n) (<= (A019565 n) (A087207 n))))))

%Y Intersection of A286608 and A286611.

%Y Subsequence of A285315.

%Y Cf. A019565, A087207, A285319, A286609.

%K nonn,base

%O 1,1

%A _Antti Karttunen_, Jun 20 2017