Harmless numbers: numbers without a, h, m or r.

Terms

a(0) =1a(1) =2a(2) =5a(3) =6a(4) =7a(5) =9a(6) =10a(7) =11a(8) =12a(9) =15a(10) =16a(11) =17a(12) =19a(13) =20a(14) =21a(15) =22a(16) =25a(17) =26a(18) =27a(19) =29a(20) =50a(21) =51a(22) =52a(23) =55a(24) =56a(25) =57a(26) =59a(27) =60a(28) =61a(29) =62