Average of twin prime pairs (A014574), divided by 2. Equivalently, 2*a(n)-1 and 2*a(n)+1 are primes.
A040040
Average of twin prime pairs (A014574), divided by 2. Equivalently, 2*a(n)-1 and 2*a(n)+1 are primes.
Terms
- a(0) =2a(1) =3a(2) =6a(3) =9a(4) =15a(5) =21a(6) =30a(7) =36a(8) =51a(9) =54a(10) =69a(11) =75a(12) =90a(13) =96a(14) =99a(15) =114a(16) =120a(17) =135a(18) =141a(19) =156a(20) =174a(21) =210a(22) =216a(23) =231a(24) =261a(25) =285a(26) =300a(27) =309a(28) =321a(29) =330
External references
- oeis: A040040