Last digit of n, phi(n) and sigma(n) is 0 in base 10.

Terms

a(0) =440a(1) =600a(2) =950a(3) =1000a(4) =1240a(5) =1320a(6) =1350a(7) =1400a(8) =1450a(9) =1640a(10) =1900a(11) =2090a(12) =2200a(13) =2440a(14) =2600a(15) =2700a(16) =2840a(17) =2850a(18) =2900a(19) =2950a(20) =2970a(21) =3000a(22) =3080a(23) =3190a(24) =3400a(25) =3720a(26) =3800a(27) =3950a(28) =3960a(29) =4040