20679087

Appears in sequences

• Numbers k such that k*(k+1)/2 + 1 is a square.at n=19A006451
• a(n) = 2*a(n-1) + a(n-2) + 1, a(0) = 1, a(1) = 2.at n=19A098790
• Numbers k such that the distance between the k-th triangular number and the nearest square is at most 1.at n=37A229083
• Numbers k such that the distance between the k-th triangular number and the nearest square is exactly 1.at n=28A229131
• Indices of triangular numbers that are eight times other triangular numbers.at n=9A336625