Numbers k such that p(k+1)# - p(k)# - p(k-1)# - 1 is prime, where p(i)# = product of first i primes = A002110(i).
A128659
Numbers k such that p(k+1)# - p(k)# - p(k-1)# - 1 is prime, where p(i)# = product of first i primes = A002110(i).
Terms
- a(0) =1a(1) =3a(2) =4a(3) =5a(4) =6a(5) =7a(6) =9a(7) =13a(8) =14a(9) =20a(10) =30a(11) =40a(12) =44a(13) =86a(14) =101a(15) =135a(16) =152a(17) =171a(18) =205a(19) =4404a(20) =12227
External references
- oeis: A128659