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 A115811 #5 Mar 31 2012 13:21:10 %S A115811 15,30,60,120,240,480,960,1920,3840,3855,7680,7695,7710,7711,7951, %T A115811 15360,15375,15390,15391,15420,15422,15423,15887,15902,15903,16143, %U A115811 30720,30735,30750,30751,30780,30782,30783,30840,30844,30846,30847 %N A115811 Integers i such that 9*i = 25 X i, but 17*i is not 49 X i. %C A115811 Here * stands for ordinary multiplication and X means carryless (GF(2)[X]) multiplication (A048720). %H A115811 <a href="/index/Con#CongruCrossDomain">Index entries for sequences defined by congruent products between domains N and GF(2)[X]</a> %Y A115811 Cf. Setwise difference of A115801 and A115809. A115812 shows this sequence in binary. %K A115811 nonn %O A115811 1,1 %A A115811 _Antti Karttunen_, Feb 01 2006