500000000

Appears in sequences

• Denominator of sum of -9th powers of divisors of n.at n=9A017682
• a(n) = floor(10^9/n).at n=1A033423
• Expansion of g.f. (1+2*x+5*x^2)/(1-10*x^3).at n=26A051109
• Expansion of (1-5*x)/(1-10*x).at n=9A093143
• First term of a run of exactly two consecutive numbers such that for each m in the run, exactly m 1's are used in writing out all numbers 1 through m.at n=5A094800
• Positive integers n for which n = f(n), where f(n) is the total number of 2's required when writing out all numbers between 0 and n.at n=3A101639
• Positive integers n for which n = f(n), where f(n) is the total number of 3's required when writing out all numbers between 0 and n.at n=10A101640
• Positive integers n for which n = f(n), where f(n) is the total number of 4's required when writing out all numbers between 0 and n.at n=10A101641
• a(n)=Product{k=0..n, 1+4^A010060(k)}/2.at n=17A101654
• Numbers k such that k and k^2 use only the digits 0, 2 and 5.at n=40A136910
• Denominator of Bernoulli(n, -1/10).at n=9A158996
• Number of compositions of even numbers into 9 parts <= n.at n=9A191496
• Number of compositions of odd natural numbers into 9 parts <= n.at n=9A191680
• List of numbers k without 1's in their decimal expansion such that k is equal to the total number of 1's in the decimal expansion of all positive numbers < k.at n=4A200863
• Triangle T(n,k) = k^n * sum(binomial(n,n-k-j),j=0..n-k).at n=50A215079
• Period of powers of 3 mod 10^n.at n=9A216099
• Period of powers of 11 mod 10^n.at n=8A216156
• Period of powers of 7 mod 10^n.at n=10A216164
• Numbers k such that the number of times digit 'm' used for writing the decimal representation of the numbers from 1 to k is equal to k for more than one value of m in the range m = 1 to 9.at n=2A216399
• Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 1,0 or 1,2.at n=11A264273