Composite numbers m such that phi(m)*sigma(m) is divisible by m-1.

Terms

a(0) =10a(1) =33a(2) =65a(3) =136a(4) =145a(5) =261a(6) =385a(7) =451a(8) =897a(9) =946a(10) =1281a(11) =1441a(12) =1665a(13) =1729a(14) =2241a(15) =2353a(16) =3585a(17) =5185a(18) =6721a(19) =7201a(20) =8380a(21) =8911a(22) =8961a(23) =11521a(24) =11782a(25) =12673a(26) =12801a(27) =17101a(28) =18241a(29) =20737