511920

Appears in sequences

• a(n) = 3*n*(3*n-1)*(3*n-2).at n=27A054776
• a(n) = lcm(3n+1, 3n+2, 3n+3).at n=26A061495
• a(n) = (4*n-1)*4*n*(4*n+1).at n=20A069140
• a(n) = n!! mod n!!!at n=18A217649
• Numbers n such that there exist three nonnegative integers a,b, and c satisfying n=a*b and (a^2+b^2)/(1+a*b) = c^2.at n=33A268198
• Length of n-th iterate of the mapping 00->0010, 01->001, 10->001, starting with 00.at n=23A289000
• Numbers k such that (in base 10) the k-th composite is a substring of the k-th prime.at n=6A378491
• Area of the unique primitive Pythagorean triple whose inradius is the n-th odd prime and whose short leg is an even number.at n=20A380302