This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A236834 #21 Mar 13 2014 14:26:02 %S A236834 25,50,55,87,91,100,110,115,117,133,143,145,159,171,174,182,185,200, %T A236834 203,213,220,230,234,237,247,249,253,266,267,279,285,286,290,299,301, %U A236834 318,319,321,333,339,342,345,348,351,355,357,361,364,369,370,375,385,391,395,400 %N A236834 Numbers that do not occur as results of "downward" remultiplication (N -> GF(2)[X]) of any number; numbers not present in A234741. %C A236834 Numbers that do not occur in A234741 (A236841). %C A236834 This is a subsequence of A236838, thus all terms are GF(2)[X]-multiples of some of the terms of A091214. (Cf. also A236844). %C A236834 a(5)=91 is the first term that does not occur in A236849. On the other hand, A236849(4)=75, is the first term in the latter which does not occur here. %H A236834 Antti Karttunen, <a href="/A236834/b236834.txt">Table of n, a(n) for n = 1..2525</a> %o A236834 (Scheme, with Antti Karttunen's IntSeq-library, two variants) %o A236834 (define A236834 (ZERO-POS 1 0 A236833)) %o A236834 (define A236834 (ZERO-POS 1 0 A236861)) %Y A236834 Complement: A236841. This sequence is a setwise difference of A236838 and A236839. %Y A236834 A091214 is a subsequence. %Y A236834 Positions of zeros in A236833, A236836, A236837 and A236861 %Y A236834 Cf. also A236844, A234741, A236835. %K A236834 nonn %O A236834 1,1 %A A236834 _Antti Karttunen_, Jan 31 2014