Euler totient function phi values of multiperfect numbers.

Terms

a(0) =1a(1) =2a(2) =12a(3) =32a(4) =240a(5) =192a(6) =4032a(7) =6912a(8) =6912a(9) =153600a(10) =435456a(11) =5529600a(12) =16773120a(13) =11059200a(14) =33177600a(15) =143327232a(16) =286654464a(17) =433520640a(18) =4294901760a(19) =2627665920a(20) =6019743744a(21) =10705305600a(22) =15925248000a(23) =15606743040a(24) =68719214592a(25) =31850496000a(26) =93640458240a(27) =100329062400a(28) =172009474560