Smallest prime q such that (p^q+1)/(p+1) is a prime, where p = prime(n).

Terms

a(0) =3a(1) =3a(2) =5a(3) =3a(4) =5a(5) =3a(6) =7a(7) =17a(8) =11a(9) =7a(10) =109a(11) =5a(12) =17a(13) =5a(14) =5a(15) =21943a(16) =17a(17) =7a(18) =3a(19) =5a(20) =7a(21) =3a(22) =19a(23) =13