270413

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 80.at n=12A031758
• A027642(6*n+6)/(sequence of period 2:repeat 42,210).at n=9A216639
• Number of nX4 0..1 arrays with every element equal to 0, 1 or 4 horizontally or vertically adjacent elements, with upper left element zero.at n=17A301658