Numbers having four 4's in base 10.

Terms

a(0) =4444a(1) =14444a(2) =24444a(3) =34444a(4) =40444a(5) =41444a(6) =42444a(7) =43444a(8) =44044a(9) =44144a(10) =44244a(11) =44344a(12) =44404a(13) =44414a(14) =44424a(15) =44434a(16) =44440a(17) =44441a(18) =44442a(19) =44443a(20) =44445a(21) =44446a(22) =44447a(23) =44448a(24) =44449a(25) =44454a(26) =44464a(27) =44474a(28) =44484a(29) =44494