5821348

Appears in sequences

• a(0)=1, a(1)=1, a(2)=1, a(n) = 2*a(n-1) + a(n-2) + 1.at n=19A033539
• a(n) = 6*a(n-1) - a(n-2) + 2, with a(0)=1, a(1)=4.at n=9A072221
• Numbers k such that triangular(k)-1 is a square and triangular(k)+1 is a prime number.at n=3A226073
• Numbers k such that the distance between the k-th triangular number and the nearest square is at most 1.at n=34A229083
• Numbers k such that the distance between the k-th triangular number and the nearest square is exactly 1.at n=26A229131
• a(0)=4, a(1)=148, a(2)=5044; a(n) = 35*(a(n-1)-a(n-2))+a(n-3).at n=4A350985