Sequence starting with 1 such that the sum of any two distinct elements has four distinct prime factors.

A181623

Sequence starting with 1 such that the sum of any two distinct elements has four distinct prime factors.

Terms

    a(0) =1a(1) =209a(2) =1121a(3) =2989a(4) =11381a(5) =34889a(6) =47701a(7) =62453a(8) =188785a(9) =878185a(10) =1761737a(11) =3931385a(12) =5630905a(13) =7990481a(14) =32892077a(15) =204570037a(16) =253223785a(17) =1353794333a(18) =2877954833

External references