Beastly (or hateful) numbers: numbers containing the string 666 in their decimal expansion.

Terms

a(0) =666a(1) =1666a(2) =2666a(3) =3666a(4) =4666a(5) =5666a(6) =6660a(7) =6661a(8) =6662a(9) =6663a(10) =6664a(11) =6665a(12) =6666a(13) =6667a(14) =6668a(15) =6669a(16) =7666a(17) =8666a(18) =9666a(19) =10666a(20) =11666a(21) =12666a(22) =13666a(23) =14666a(24) =15666a(25) =16660a(26) =16661a(27) =16662a(28) =16663a(29) =16664