199927

Appears in sequences

• a(n) = n*(n-1)^4/2.at n=14A019583
• Terms of A072390 (sums of two powers of 13) divided by 2.at n=19A073220
• Numbers of the form (7^i)*(13^j).at n=20A108056
• a(n) = ((n-th prime)^6-(n-th prime)^4)/24.at n=5A138458
• Consider primitive pairs of integers (b, c) with b > 0 such that x^5 + b*x + c = 0 is irreducible and solvable by radicals: sequence gives values of c.at n=29A371554
• a(n) is the smallest number k in the sorted sequence S(q) = {k : rad(k) = q}, q = A120944(n), such that tau(k) - A008479(k) is not positive, where rad = A007947 and tau = A000005.at n=31A373737
• Integers k such that k = Sum k/(p_i + j), where p_i are the prime factors of k (with multiplicity). Case j = -5.at n=8A380927