Primes of the form p = k*10^m - 1 where k is 3, 6 or 9, such that p+2 is also a prime.
A124643
Primes of the form p = k*10^m - 1 where k is 3, 6 or 9, such that p+2 is also a prime.
Terms
- a(0) =29a(1) =59a(2) =599a(3) =2999a(4) =8999a(5) =29999999
External references
- oeis: A124643