a(n) is the number of prime palindromes with 2n+1 digits.
A040025
a(n) is the number of prime palindromes with 2n+1 digits.
Terms
- a(0) =4a(1) =15a(2) =93a(3) =668a(4) =5172a(5) =42042a(6) =353701a(7) =3036643a(8) =27045226a(9) =239093865a(10) =2158090933a(11) =19742800564a(12) =180815391365
External references
- oeis: A040025