A382457 Number of twin self-primes <= 10^n.
2, 2, 2, 2, 12, 87, 534, 3683, 27738, 231431, 2061879
Offset: 1
Links
- Shyam Sunder Gupta, On Some Marvellous Numbers of Kaprekar, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 9, 275-315.
Extensions
a(11) from Amiram Eldar, Apr 04 2025