40587

Appears in sequences

• Numbers k = p*q*r (p, q, r prime) congruent to 0 mod p+q+r.at n=36A160394
• Partial sums of the third power of the arithmetic derivative function A003415.at n=15A231946
• Fibonacci-Zumkeller numbers: a(n)=n if n<=3, otherwise the smallest number >= a(n-2) + a(n-1) having at least one common factor with a(n-2), but none with a(n-1).at n=20A249357
• Numbers n = p * q, where n, p, and q together contain all 10 digits at least once.at n=54A253172
• Products of three distinct primes that form an arithmetic progression.at n=31A262723
• Positions of 3's in A264977; positions of 6's in A277330.at n=52A277713
• Numbers n such that (6k-1) for k=n, n+1, n+2, n+3 are all primes with no primes of the form (6k+1) in between.at n=34A296011
• Expansion of (1/(1 - x))*Product_{k>=1} (1 + x^k)^k.at n=19A302832
• Numbers x that are equal to lpf(x)*gpf(x)*(lpf(x)+gpf(x))/2, where lpf(x) < gpf(x) are the least and the greatest prime factors of x: A020639 and A006530.at n=36A307108
• Odd squarefree composite numbers k, divisible by the sum of their prime factors, sopfr (A001414).at n=27A308643
• a(n) is the largest integer x such that x/sopf(x) = prime(n) where sopf(x) is the sum of distinct prime factors of x and prime(n) is the n-th prime.at n=37A336493