19539

Appears in sequences

• Number of three-prime Carmichael numbers less than 10^n.at n=14A132195
• a(n) = (2*n^3 + 5*n^2 + 21*n)/2.at n=25A162266
• a(n) = Sum_{k=0..n} q(k)^2, where q(k) = partition numbers into distinct parts (A000009).at n=21A265093