The number of distinct primes < 10^n which are members of twin-prime pairs.
A167874
The number of distinct primes < 10^n which are members of twin-prime pairs.
Terms
- a(0) =3a(1) =15a(2) =69a(3) =409a(4) =2447a(5) =16337a(6) =117959a(7) =880623a(8) =6849011a(9) =54825357a(10) =448752095a(11) =3741170439a(12) =31669329743a(13) =271560643329
External references
- oeis: A167874