Integer solutions x to sigma(x) + sigma(x+1) = 2*sigma(2x+1) where sigma = A000203.

Terms

a(0) =215a(1) =923a(2) =944a(3) =1715a(4) =2379a(5) =5355a(6) =38429a(7) =87584a(8) =110483a(9) =212795a(10) =291039a(11) =1016519a(12) =1051644a(13) =1198139a(14) =2729979a(15) =9380447a(16) =9397674a(17) =31476500a(18) =31749948a(19) =33146259a(20) =33497064a(21) =47004099a(22) =50482278a(23) =52026408a(24) =54114528a(25) =61571795a(26) =79000679a(27) =162914079a(28) =190974539a(29) =212196564