Least k such that gcd(prime(k)+1, prime(k+1)+1) = 2n.

Terms

a(0) =2a(1) =4a(2) =9a(3) =72a(4) =34a(5) =91a(6) =62a(7) =478a(8) =205a(9) =2016a(10) =522a(11) =909a(12) =1440a(13) =5375a(14) =2149a(15) =6610a(16) =7604a(17) =2976a(18) =5229a(19) =7488a(20) =11251a(21) =7499a(22) =8805a(23) =20179a(24) =18526a(25) =70885a(26) =28193a(27) =40985a(28) =33847a(29) =17625