a(n) = least k such that the remainder when 28^k is divided by k is n.

Terms

a(0) =3a(1) =13a(2) =5a(3) =6a(4) =23a(5) =11a(6) =15a(7) =194a(8) =19a(9) =18a(10) =17a(11) =148a(12) =213a(13) =22a(14) =131209a(15) =20a(16) =2335a(17) =25a(18) =7311a(19) =44a(20) =259a(21) =51a(22) =5263a(23) =38a(24) =21927a(25) =758a(26) =240055a(27) =29a(28) =803a(29) =58