142373

Appears in sequences

• Numbers k such that core(k) = b(k,1)*b(k,0) where b(k,1) is the number of 1's in binary representation of k, b(k,0) the number of 0's and core(k) the squarefree part of k.at n=14A071639
• Vassiliev invariant of fourth order for the torus knots.at n=21A180324
• Numbers with three distinct prime factors (each of which may or may not be repeated) which when concatenated in any order form a prime number.at n=10A181559
• a(n) = n^2*(n*(4*n + 3) + 3*n*(-1)^n - 4)/96.at n=42A302758