531531

Appears in sequences

• Sums of 3 distinct powers of 9.at n=22A038488
• Form array in which n-th row is obtained by expanding (1+x+x^2)^n and taking the 5th column from the center.at n=10A098470
• Triangle read by rows, the coefficients of J. L. Fields generalized Bernoulli polynomials.at n=24A220412
• Composite numbers k such that k = q_1^b_1 * ... * q_r^b_r with r >= 2, where q_1 < q_2 < ... < q_r are the prime factors of k and there exists some positive integer m that satisfies k = q_1^m + q_2 + q_3 + ... + q_r.at n=7A330939
• a(n) = Sum_{d|n} n^phi(d).at n=8A345893