Numbers k such that sigma(k) + tau(k) = 2k.

Terms

a(0) =1a(1) =3a(2) =14a(3) =52a(4) =130a(5) =184a(6) =656a(7) =8648a(8) =12008a(9) =34688a(10) =2118656a(11) =33721216a(12) =40575616a(13) =59376256a(14) =89397016a(15) =99523456a(16) =134438912a(17) =150441856a(18) =173706136a(19) =283417216a(20) =537346048a(21) =1082640256a(22) =6801628304a(23) =91707741184