21908

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 74.at n=3A031752
• a(n) = 16*n^2 + 4.at n=36A158444
• Partial sums of the squares of the numbers in sequence A080253.at n=3A217487
• Number of ordered trees with n edges such that non-leaf vertices at even (odd) level have an odd (even) number of children.at n=14A248096
• Expansion of Product_{k>=1} (1 + x^k)^A065958(k).at n=11A301980
• a(n) is the smallest k such that A345699(k) = n.at n=19A345763