a(n) = least k such that the remainder when 15^k is divided by k is n.

Terms

a(0) =2a(1) =13a(2) =6a(3) =11a(4) =10a(5) =533a(6) =218a(7) =119a(8) =12a(9) =145a(10) =214a(11) =57a(12) =106a(13) =17149a(14) =17a(15) =3736136819a(16) =26a(17) =117a(18) =206a(19) =143a(20) =34a(21) =427a(22) =202a(23) =871a(24) =40a(25) =25397a(26) =54a(27) =6877a(28) =52a(29) =115