291627

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=26A031718
• a(n) = 729*n^2 + 27.at n=20A158645
• a(n) = lcm(1,2,...,n) * Sum_{k=1..n} (2^(k-1) - 1) / k.at n=9A331343