%I #7 Mar 13 2014 14:26:22
%S 5,10,15,17,20,23,27,29,30,34,39,40,45,46,51,53,54,57,58,60,65,68,71,
%T 75,78,80,83,85,90,92,95,99,101,102,105,106,107,108,113,114,116,119,
%U 120,127,129,130,135,136,139,141,142,147,150,151,153,156,160,163,165
%N Numbers that occur in more than one way as results of "downward" remultiplication (N -> GF(2)[X]) of some number.
%C Numbers that occur more than once in A234741.
%H Antti Karttunen, <a href="/A236835/b236835.txt">Table of n, a(n) for n = 1..3385</a>
%F For all n, A236379(a(n)) > 0.
%e 5 occurs here, because it occurs in A234741 both as A234741(5)=5 and A234741(9)=5, as A048720(3,3)=5.
%e 43 do not occur here, as although it is a term of A091209, it only occurs at A234741(43) as it cannot be obtained by other means as a carryless product than as 43 = A048720(3,25).
%o (Scheme, with _Antti Karttunen_'s IntSeq-library)
%o (define A236835 (MATCHING-POS 1 0 (lambda (n) (> (A236833 n) 1))))
%Y Positions of terms larger than one in A236833.
%Y Cf. A236833, A236834. A091209 is NOT a subsequence.
%K nonn
%O 1,1
%A _Antti Karttunen_, Jan 31 2014