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 A067400 #5 Aug 02 2017 23:47:12 %S A067400 15,30,31,60,62,63,85,95,111,120,123,124,125,126,127,170,175,190,191, %T A067400 207,222,223,239,240,243,245,246,247,248,250,251,252,253,254,255,340, %U A067400 341,350,351,367,379,380,381,382,383,399,414,415,443,444,445,446,447 %N A067400 Non-uniquely factorizable OR-numbrals, i.e., numbrals for which there exist more than one different factorizations into irreducible factors (modulo order). %C A067400 See A048888 for the definition of OR-numbral arithmetic. %e A067400 15 is in A067400 since [15] = [3] * [5] = [3]^3 and [3] and [5] are irreducible. %Y A067400 Cf. A003986, A007059, A048888, A067138, A067139, A067398, A067399, A067401. %K A067400 nonn %O A067400 1,1 %A A067400 _Jens Voß_, Jan 24 2002