Unique period lengths of primes mentioned in A007615.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =9a(5) =10a(6) =12a(7) =14a(8) =19a(9) =23a(10) =24a(11) =36a(12) =38a(13) =39a(14) =48a(15) =62a(16) =93a(17) =106a(18) =120a(19) =134a(20) =150a(21) =196a(22) =294a(23) =317a(24) =320a(25) =385a(26) =586a(27) =597a(28) =654a(29) =738