Numbers k such that sigma(k+1) = 2*sigma(k).

Terms

a(0) =5a(1) =125a(2) =1253a(3) =1673a(4) =3127a(5) =5191a(6) =7615a(7) =12035a(8) =43817a(9) =47795a(10) =48559a(11) =49955a(12) =56975a(13) =58373a(14) =61721a(15) =63545a(16) =68033a(17) =78395a(18) =97411a(19) =106001a(20) =108473a(21) =109939a(22) =111451a(23) =111683a(24) =123497a(25) =123797a(26) =131659a(27) =137081a(28) =192065a(29) =192279