Least multiple of n == -1 (mod prime(n)).

Terms

a(0) =1a(1) =2a(2) =9a(3) =20a(4) =10a(5) =12a(6) =84a(7) =56a(8) =45a(9) =260a(10) =154a(11) =36a(12) =286a(13) =42a(14) =375a(15) =688a(16) =884a(17) =792a(18) =133a(19) =780a(20) =1386a(21) =1342a(22) =414a(23) =1512a(24) =775a(25) =1716a(26) =1647a(27) =1176a(28) =435a(29) =1920