52507

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 21 ones.at n=31A031789
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= n/3.at n=19A047199
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n-1)/3.at n=19A048011
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n-2)/3.at n=19A048022
• Numbers k such that 10^999 + k is a (titanic) prime.at n=29A074282
• Number of labeled rooted trees on n nodes with thinning limbs.at n=6A124347
• Numbers that are the sum of four third powers in exactly eight ways.at n=27A345153