25000

Appears in sequences

• Number of transitive permutation groups of degree n.at n=23A002106
• Numbers k such that the decimal expansion of k^2 contains k as a substring.at n=27A018834
• Numbers of form 5^i*8^j, with i, j >= 0.at n=21A025623
• Numbers of form 5^i*10^j, with i, j >= 0.at n=19A025625
• Substring of both its square and its cube.at n=25A029943
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 79.at n=35A031577
• a(n) = floor(10^5/n).at n=3A033427
• Numbers whose prime factors are 2 and 5.at n=35A033846
• Number of partitions of n into parts not of the form 11k, 11k+4 or 11k-4. Also number of partitions with at most 3 parts of size 1 and differences between parts at distance 4 are greater than 1.at n=45A035947
• Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*8^j.at n=16A038250
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*5^j.at n=19A038283
• Ambitious numbers: numbers n with the property that if a number ends in n then it is divisible by n.at n=20A039690
• Internal digits of n^2 include digits of n as substring.at n=14A046836
• Iterated procedure 'composite k added to sum of its prime factors reaches a prime' yields 1 skipped prime.at n=16A050768
• Numbers of the form 2^i*5^j where i+j is even.at n=28A054901
• Numbers n such that sum of the cubes of the distinct prime factors of n equals the sum of the cubes of the digits of n.at n=7A067170
• Numbers n such that sum of the squares of the prime factors of n equals the sum of the squares of the digits of n.at n=11A067184
• Treated as strings, the concatenation c of the prime factors of n, in increasing order, is an initial segment of n. Equivalently, n begins with c.at n=9A069154
• Numbers k such that k^4 has k as a substring of its decimal expansion.at n=47A075904
• a(0) = 1, a(1) = 2, a(2) = 5; for n > 2, a(n) = a(n-1)*a(n-2).at n=6A076776