90582

Appears in sequences

• a(n) = (1/2) * (5*P(n+1) + P(n) - 1), where P(k) are the Pell numbers A000129.at n=12A098586
• Nonnegative integers n such that 2n^2 + 2n - 3 is square.at n=13A124124
• Number of (n+1) X (n+1) -3..3 symmetric matrices with every 2 X 2 subblock having sum zero and two or three distinct values.at n=11A211325
• Numbers k where d/k reaches a new record, with d the distance from the k-th triangular number to the nearest square.at n=17A229117