Nonprimes n such that 5^n==5 (mod n).

Terms

a(0) =1a(1) =4a(2) =10a(3) =15a(4) =20a(5) =65a(6) =124a(7) =190a(8) =217a(9) =310a(10) =435a(11) =561a(12) =781a(13) =1105a(14) =1541a(15) =1729a(16) =1891a(17) =2465a(18) =2821a(19) =3565a(20) =3820a(21) =4123a(22) =4495a(23) =5461a(24) =5611a(25) =5662a(26) =5731a(27) =6601a(28) =6735a(29) =7449