a(n) is the least k > n such that A007504(n) divides A007504(k).

Terms

a(0) =3a(1) =3a(2) =9a(3) =13a(4) =33a(5) =15a(6) =121a(7) =84a(8) =103a(9) =26a(10) =259a(11) =295a(12) =433a(13) =71a(14) =111a(15) =331a(16) =317a(17) =366a(18) =649a(19) =80a(20) =283a(21) =274a(22) =429a(23) =4542a(24) =3071a(25) =2138a(26) =4241a(27) =74a(28) =761a(29) =3083