a(n) is the n-th smallest integer m which is the product of 4 odd primes m=p1*p2*p3*p4 such that d+2*m/d are all primes for each d dividing 2*m.
A128277
a(n) is the n-th smallest integer m which is the product of 4 odd primes m=p1*p2*p3*p4 such that d+2*m/d are all primes for each d dividing 2*m.
Terms
- a(0) =93081a(1) =449985a(2) =1523705a(3) =301921991a(4) =899343761a(5) =1581262341a(6) =7290929465a(7) =12102153569a(8) =25404516309a(9) =27482957831a(10) =38661868781a(11) =49656488021a(12) =240305617889a(13) =305000299185a(14) =341656377581a(15) =377737353491
External references
- oeis: A128277