A062402(x)=sigma(phi[x]) function is iterated; initial value=2^n; a(n)=smallest term of trajectory.

Terms

a(0) =1a(1) =3a(2) =7a(3) =15a(4) =31a(5) =63a(6) =127a(7) =255a(8) =511a(9) =1023a(10) =2047a(11) =4095a(12) =8191a(13) =6045a(14) =24552a(15) =65535a(16) =131071a(17) =262143a(18) =524287a(19) =1048575a(20) =2097151a(21) =4194303a(22) =8388607a(23) =16777215a(24) =33554431a(25) =67108863a(26) =134217727a(27) =268435455a(28) =536870911a(29) =1073741823