Composite numbers k such that sigma(k + sigma(k)) = 2*sigma(k).

Terms

a(0) =329a(1) =413a(2) =623a(3) =869a(4) =979a(5) =1819a(6) =2585a(7) =3107a(8) =3173a(9) =3197a(10) =3887a(11) =4235a(12) =4997a(13) =5771a(14) =6149a(15) =6187a(16) =6443a(17) =7409a(18) =8399a(19) =8759a(20) =14429a(21) =15323a(22) =18515a(23) =19019a(24) =21181a(25) =21413a(26) =23989a(27) =26491a(28) =29749a(29) =30355