291640

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 27.at n=19A031705
• a(n) = 729*n^2 + 2*n.at n=19A158396
• Least k such that the k-th prime number has exactly n ones in its binary expansion.at n=20A372517
• Sorted list of positions of first appearances in A014499 (number of ones in binary expansion of each prime).at n=20A372686