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).
A128661
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) =3a(1) =7a(2) =14a(3) =15a(4) =21a(5) =32a(6) =34a(7) =47a(8) =67a(9) =69a(10) =174a(11) =369a(12) =568a(13) =3193a(14) =3882a(15) =5426
External references
- oeis: A128661