Numbers n such that sigma(n+1)+sigma(n)=3n.

Terms

a(0) =10a(1) =34a(2) =136a(3) =169a(4) =2402a(5) =5329a(6) =21004a(7) =41164a(8) =54722a(9) =1060802a(10) =5026562a(11) =10800112a(12) =11108164a(13) =14366402a(14) =87026656a(15) =102944992a(16) =10499710072a(17) =107000850688a(18) =220200311872a(19) =924354816004