Number of moduli m such that the multiplicative order of n mod m equals n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =9a(5) =10a(6) =12a(7) =72a(8) =112a(9) =33a(10) =12a(11) =212a(12) =42a(13) =22a(14) =108a(15) =96a(16) =35a(17) =456a(18) =6a(19) =1912a(20) =714a(21) =220a(22) =60a(23) =5364a(24) =4032a(25) =747a(26) =448a(27) =3944a(28) =762a(29) =24370