50000000

Appears in sequences

• Denominator of sum of -8th powers of divisors of n.at n=9A017680
• a(n)/10000000 gives sqrt(n) to 7 places.at n=24A027664
• a(n) = floor(10^9/n).at n=19A033423
• a(n) = floor(10^8/n).at n=1A033424
• Hexamorphic numbers: k such that the k-th hexagonal number ends with k.at n=39A039594
• Expansion of g.f. (1+2*x+5*x^2)/(1-10*x^3).at n=23A051109
• a(n) = denominator(N) where N = 0.123...n (concatenation of 1 to n after decimal point).at n=7A078257
• Expansion of (1-5*x)/(1-10*x).at n=8A093143
• Expansion of (1 + 8x - 42x^2 - 392x^3)/(1 - 99x^2 + 2450x^4).at n=9A097114
• a(n)=Product{k=0..n, 1+4^A010060(k)}/2.at n=15A101654
• Numbers k such that k and k^2 use only the digits 0, 2 and 5.at n=27A136910
• Numbers k such that k and k^2 use only the digits 0, 2, 5 and 7.at n=41A136915
• Number of compositions of even natural numbers into 8 parts <= n.at n=9A191495
• Number of compositions of odd natural numbers into 8 parts <=n.at n=9A191899
• Numbers covering A000027: a(n) = (1, 1, 2, 5) * A011557(n).at n=31A194350
• Period of powers of 3 mod 10^n.at n=8A216099
• Period of powers of 11 mod 10^n.at n=7A216156
• Period of powers of 7 mod 10^n.at n=9A216164
• Let x(1)x(2)... x(2q) denote the decimal expansion of a number n with an even number of digits. The sequence lists the numbers n such that (10^q-a)*(10^q-b) = n where a is the number having the digits x(1)x(2)...x(q) and b is the number having the digits x(q+1)x(q+2)...x(2q).at n=17A245587
• a(n) = 2^((n-1) mod 2)*5*10^floor((n-1)/2).at n=15A268100