Semiprimes with digits in descending order that differ exactly by 2.
A245044
Semiprimes with digits in descending order that differ exactly by 2.
Terms
- a(0) =4a(1) =6a(2) =9a(3) =86a(4) =753a(5) =7531a(6) =9753a(7) =97531
External references
- oeis: A245044