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.
A356825
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) =9a(2) =33a(3) =65a(4) =77a(5) =161a(6) =371a(7) =38981a(8) =2561a(9) =568181
External references
- oeis: A356825