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 A270794 #5 Apr 06 2016 12:47:52 %S A270794 6,9,18,26,45,57,81,91,112,143,165,203,228,244,267,303,345,354,411, %T A270794 437,454,495,530,564,623,668,687,714,728,749,856,893,931,959,1032, %U A270794 1054,1104,1158,1185,1233,1268,1298,1372,1392,1425,1445,1539,1672,1698,1714,1742,1773,1802,1886,1914,1966,2031,2050,2104 %N A270794 The prime/nonprime compound sequence BAA. %p A270794 # For Maple code for the prime/nonprime compound sequences (listed in cross-references) see A003622. - _N. J. A. Sloane_, Mar 30 2016 %Y A270794 Let A = primes A000040, B = nonprimes A018252. The 2-level compounds are AA = A006450, AB = A007821, BA = A078782, BB = A102615. The 3-level compounds AAA, AAB, ..., BBB are A038580, A049078, A270792, A102617, A270794, A270796, A102216. %K A270794 nonn %O A270794 1,1 %A A270794 _N. J. A. Sloane_, Mar 30 2016