Largest prime factor of A001008(n), numerator of n-th harmonic number; a(1) = 1.

Terms

a(0) =1a(1) =3a(2) =11a(3) =5a(4) =137a(5) =7a(6) =11a(7) =761a(8) =7129a(9) =61a(10) =863a(11) =509a(12) =919a(13) =1117a(14) =41233a(15) =8431a(16) =1138979a(17) =39541a(18) =7440427a(19) =11167027a(20) =18858053a(21) =227a(22) =583859a(23) =467183a(24) =312408463a(25) =34395742267a(26) =215087a(27) =375035183a(28) =4990290163a(29) =17783