a(n) is the n-th number m that divides n^m - 1 (or 0 if m does not exist).

Terms

a(0) =1a(1) =0a(2) =4a(3) =21a(4) =8a(5) =1555a(6) =9a(7) =6223a(8) =40a(9) =999a(10) =20a(11) =130801a(12) =24a(13) =4484077a(14) =128a(15) =117a(16) =60a(17) =118285781329a(18) =42a(20) =104a(21) =819a(22) =72a(23) =302508121a(24) =81a(25) =75625a(26) =200a(27) =61731a(28) =78a(30) =72a(31) =21958351241