67613

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 40.at n=12A031718
• a(n) = 169*n^2 + 13.at n=20A158548
• Expansion of Product_{k>=1} (1 + x^(2*k-1))^(2*k-1).at n=33A262736
• Positive numbers k such that -k, -(k + 1), -(k + 2), and -(k + 3) are 4 consecutive negative negabinary-Niven numbers (A331728).at n=26A331825