3547970

Appears in sequences

• Numbers k such that k*(k+1)/2 + 1 is a square.at n=17A006451
• a(n) = 2*a(n-1) + a(n-2) + 1, a(0) = 1, a(1) = 2.at n=17A098790
• Numbers k such that the distance between the k-th triangular number and the nearest square is at most 1.at n=33A229083
• Numbers k such that the distance between the k-th triangular number and the nearest square is exactly 1.at n=25A229131