54705

Appears in sequences

• Bruckman-Lucas pseudoprimes: k | (L_k - 1), where k is composite and L_k = Lucas numbers A000032.at n=15A005845
• a(1) = 1, a(n+1) = a(n) + gpf(Sum_{i=1..n} a(i)), where gpf=A006530 (greatest prime factor).at n=22A080182
• Number of nX4 0..1 arrays with exactly n+4-1 having value 1 and no three 1s forming an isosceles right triangle.at n=12A272961