47039

Appears in sequences

• Denominators of continued fraction convergents to sqrt(839).at n=6A042621
• a(n) = (7*n^3 + 6*n^2 + 5*n) / 6.at n=34A101165
• Grow a binary tree using the following rules. Initially there is a single node labeled 1. At each step we add 1 to all labels less than 3. If a node has label 3 and zero or one descendants we add a new descendant labeled 1. Sequence gives sum of all labels at step n.at n=47A123015
• a(n) = 60*n^2 - 1.at n=27A158670
• Indices of the triangular numbers in A189475.at n=29A358417