57000

Appears in sequences

• Number of labeled plane 2-trees with n nodes.at n=5A003092
• Numbers n such that 107*2^n-1 is prime.at n=24A050579
• a(n) = binomial(n+2,2) * binomial(n+7,2).at n=18A104676
• Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=12.at n=21A135197
• a(n) = 1728*n - 24.at n=32A157287
• Numbers n such that sigma(n) = 13*phi(n) (where sigma=A000203, phi=A000010).at n=5A171258
• Numbers with prime factorization p*q*r^3*s^3 (where p, q, r, s are distinct primes).at n=32A190108
• a(n) = number of ordered triples (w,x,y) such that w,x,y are all in {0,...,n} and the numbers |w-x|, |x-y|, |y-w| are distinct.at n=39A212963
• Numbers with the property that in their factorization over distinct terms of A050376, the sums of prime and nonprime terms of A050376 are equal.at n=31A241270
• Erroneous version of A003092.at n=4A259467
• Number of triple-crossings of diagonals in the regular 2n-gon.at n=38A260417
• Number of maximal subsets of {1..n} such that every pair of distinct elements has a different quotient.at n=32A325861
• Numbers that are not palindromes even after removing trailing zeros and are divisible by their reverses.at n=31A345361
• a(n) = 3^n - 2^(n+1) - 1.at n=9A368956