Numbers k such that prime(k)*prime(k)# - 1 is prime, where prime(k)# is the k-th primorial.
A103538
Numbers k such that prime(k)*prime(k)# - 1 is prime, where prime(k)# is the k-th primorial.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =5a(4) =6a(5) =7a(6) =13a(7) =16a(8) =20a(9) =23a(10) =64a(11) =191a(12) =490a(13) =3620a(14) =5909
External references
- oeis: A103538