313230domain: NAppears in sequencesa(n) = [ a(n-1)/a(1) ] + [ a(n-2)/a(2) ] + ... + [ a(1)/a(n-1) ], for n >= 3.at n=31A022876Number of prime knots with <= n crossings.at n=14A116584Numbers k such that sum of 4th power of digits of k equals the sum of prime divisors of k.at n=21A217532