a(n) = n^phi(n) + 1.

Terms

a(0) =2a(1) =3a(2) =10a(3) =17a(4) =626a(5) =37a(6) =117650a(7) =4097a(8) =531442a(9) =10001a(10) =25937424602a(11) =20737a(13) =7529537a(14) =2562890626a(15) =4294967297a(17) =34012225a(19) =25600000001a(23) =110075314177