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 A270796 #5 Apr 06 2016 12:47:52 %S A270796 8,10,15,20,27,32,38,40,49,58,63,72,78,82,88,99,110,114,121,125,129, %T A270796 140,146,155,166,172,175,183,185,189,212,217,225,230,245,248,258,265, %U A270796 272,279,289,292,306,309,315,319,334,355,360,362,368,375,377,393,402,408,416,420,427,435,438,452,473,478,482,486,507 %N A270796 The prime/nonprime compound sequence BBA. %p A270796 # For Maple code for the prime/nonprime compound sequences (listed in cross-references) see A003622. - _N. J. A. Sloane_, Mar 30 2016 %Y A270796 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 A270796 nonn %O A270796 1,1 %A A270796 _N. J. A. Sloane_, Mar 30 2016