Numbers n such that 2^n == 1 (mod sigma(n)).

Terms

a(0) =1a(1) =2a(2) =8a(3) =25a(4) =36a(5) =50a(6) =72a(7) =128a(8) =200a(9) =288a(10) =900a(11) =1152a(12) =1764a(13) =1800a(14) =2304a(15) =3200a(16) =3528a(17) =7200a(18) =8712a(19) =10404a(20) =14112a(21) =20808a(22) =27848a(23) =28224a(24) =28800a(25) =32768a(26) =44100a(27) =56448a(28) =57600a(29) =83232