71442

Appears in sequences

• a(n) = 9*(n-2)^2 * (n^2 - 2*n - 1).at n=9A060788
• Least number k such that k has n anti-divisors.at n=36A066464
• Numbers n such that the squarefree kernel of n is equal to the number of divisors of n.at n=23A070226
• Numbers whose product of exponents is equal to the sum of prime factors.at n=40A071175
• Stirling2 triangle with scaled diagonals (powers of 3).at n=41A075498
• Sixth column of triangle A075498.at n=3A075516
• Even refactorable numbers k such that the number r of odd divisors and the number s of even divisors are both odd divisors of k and k is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of k.at n=10A120358
• Even refactorable numbers k such that the number r of odd divisors of k and the number s of even divisors of k are both odd divisors of k.at n=28A120361
• Non-deficient numbers with odd sigma such that the sum of the even divisors is twice the sum of the odd divisors.at n=35A171642
• Numbers k such that tau(phi(k)) = rad(k).at n=20A173618
• Number of bases to which terms of A141768 are strong pseudoprimes.at n=24A195328
• Number of n X 2 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z.at n=12A209368
• Numbers k such that k*product_of_digits(k) is a nonzero cube.at n=13A229544
• Depth of Pascal's triangle such that the number of elements in the triangle is a factor of the sum of the elements.at n=25A272934
• Numbers n such that n is the sum of two nonzero squares while n^2 is the sum of two positive cubes.at n=41A273554
• Refactorable numbers that are twice a square.at n=45A376114