Numbers k such that (sigma(k)+sigma(k+1))/k is an integer.

Terms

a(0) =1a(1) =10a(2) =34a(3) =136a(4) =169a(5) =2402a(6) =5329a(7) =21004a(8) =38184a(9) =41164a(10) =54722a(11) =458010a(12) =776112a(13) =1060802a(14) =5026562a(15) =10800112a(16) =11108164a(17) =14366402a(18) =65676408a(19) =87026656a(20) =102944992a(21) =387999360a(22) =1488668112a(23) =4414086384a(24) =10499710072a(25) =28645019964