Primes of the form b*10^(2*k) + b*10^k + 1 for 1 <= b <= 9, k >= 0.
A309739
Primes of the form b*10^(2*k) + b*10^k + 1 for 1 <= b <= 9, k >= 0.
Terms
- a(0) =3a(1) =5a(2) =7a(3) =11a(4) =13a(5) =17a(6) =19a(7) =331a(8) =661a(9) =881a(10) =991a(11) =20201a(12) =60601a(13) =90901a(14) =2002001a(15) =5005001a(16) =300030001a(17) =600060001a(18) =50000500001
External references
- oeis: A309739