Number of integers k < 10^n such that k*(k+1)-1 and k*(k+3)-1 are both first of twin primes.
A138301
Number of integers k < 10^n such that k*(k+1)-1 and k*(k+3)-1 are both first of twin primes.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =11a(4) =37a(5) =145a(6) =673a(7) =3748a(8) =22875
External references
- oeis: A138301