Numbers k such that k^2-1 is a triangular number and k^2+1 is a prime.
A226070
Numbers k such that k^2-1 is a triangular number and k^2+1 is a prime.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =134a(4) =2174a(5) =154634
External references
- oeis: A226070
A226070
Numbers k such that k^2-1 is a triangular number and k^2+1 is a prime.