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 A162731 #10 Aug 29 2021 18:57:06 %S A162731 6,10,15,18,24,26,27,39,42,42,45,50,60,63,66,65,70,74,75,90,91,96,99, %T A162731 100,105,111,114,114,122,120,125,135,140,146,150,147,162,160,165,168, %U A162731 170,171,170,175,183,186,185,190,204,210,219,225,224,234,231,231,242,238,243,250 %N A162731 a(n) is the n-th triprime (A014612) minus its central prime factor. %F A162731 a(n) = A014612(n) - A162361(n). %e A162731 a(1) = 6 = 2*2*2 - 2; %e A162731 a(2) = 10 = 2*2*3 - 2; %e A162731 a(3) = 15 = 2*3*3 - 3; %e A162731 a(4) = 18 = 2*2*5 - 2; %e A162731 a(5) = 24 = 3*3*3 - 3. %Y A162731 Cf. A014612, A162361. %K A162731 nonn,less %O A162731 1,1 %A A162731 _Juri-Stepan Gerasimov_, Jul 12 2009 %E A162731 Definition reformulated, a(11), a(38) etc. corrected by _R. J. Mathar_, Jul 16 2009