54144

Appears in sequences

• The sum of the non-divisors of n (less than n) is a multiple of the sum of the divisors of n.at n=24A066860
• Composite numbers k such that (k+1)*sigma(k) is a perfect square.at n=11A073586
• Numbers k such that sum of the divisors d of k divides 1 + 2 + ... + k = k(k+1)/2.at n=26A076617
• a(n) = Fibonacci(n) * (Fibonacci(n+2) - 1).at n=11A143212
• a(n) = 94*n^2.at n=24A174337
• Numbers with prime factorization pq^2r^7.at n=20A190466
• Number of n-variations of the set {1,2,...,n+1} satisfying p(i)-i in {-2,0,2}, i=1..n (an n-variation of the set N_{n+s} = {1,2,...,n+s} is any 1-to-1 mapping p from the set N_n = {1,2,...,n} into N_{n+s} = {1,2,...,n+s}).at n=22A217694
• Number of 3 X n arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 3 X n array.at n=13A219884
• The greedy sequence of real numbers at least 1 that do not contain any 3-term geometric progressions with integer ratio.at n=29A235054