21722

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 47.at n=29A020386
• Schoenheim bound L_1(n,n-4,n-5).at n=35A036830
• a(n) is the smallest composite k such that Sum_{composites j = 4, ..., k} 1/j exceeds n.at n=6A076751
• Sum(j=1,n,floor(A000041(j)/j)).at n=47A086736
• Indices of primes in the 8th-order Fibonacci number sequence, A123526.at n=35A254412
• a(n) is the smallest composite k such that Sum_{composites j = 4, ..., k} 1/j exceeds n/2.at n=13A331930