Number of distinct subsemigroups of the multiplicative semigroup of integers modulo n.

Terms

a(0) =1a(1) =3a(2) =5a(3) =8a(4) =7a(5) =26a(6) =9a(7) =29a(8) =20a(9) =42a(10) =9a(11) =168a(12) =13a(13) =58a(14) =106a(15) =141a(16) =11a(17) =220a(18) =13a(19) =504a(20) =141a(21) =58a(22) =9a(23) =1997a(24) =66a(25) =99a(26) =279a(27) =1420a(28) =13a(29) =2764