Numbers k such that triangular(k)-1 is a square and triangular(k)+1 is a prime number.
A226073
Numbers k such that triangular(k)-1 is a square and triangular(k)+1 is a prime number.
Terms
- a(0) =1a(1) =4a(2) =148a(3) =5821348
External references
- oeis: A226073