Sequence starting with 2 such that the sum of any two distinct terms is a semiprime having two distinct prime factors.
A181620
Sequence starting with 2 such that the sum of any two distinct terms is a semiprime having two distinct prime factors.
Terms
- a(0) =2a(1) =4a(2) =31a(3) =91a(4) =183a(5) =4411a(6) =29611a(7) =59935a(8) =110791a(9) =10418851a(10) =658653031a(11) =20123369491a(12) =518294316451a(13) =947137685251
External references
- oeis: A181620