a(n) is the least semiprime p*q such that p*q+i*(p+q) is prime for i from 1 to n but not n+1.
A356801
a(n) is the least semiprime p*q such that p*q+i*(p+q) is prime for i from 1 to n but not n+1.
Terms
- a(0) =4a(1) =6a(2) =15a(3) =155a(4) =35a(5) =851a(6) =34601a(7) =474869a(8) =15157931a(9) =1467715961
External references
- oeis: A356801