5000000

Appears in sequences

• Denominator of sum of -7th powers of divisors of n.at n=9A017678
• a(n) = floor(10^8/n).at n=19A033424
• a(n) = floor(10^7/n).at n=1A033425
• Hexamorphic numbers: k such that the k-th hexagonal number ends with k.at n=33A039594
• Ambitious numbers: numbers n with the property that if a number ends in n then it is divisible by n.at n=31A039690
• Expansion of g.f. (1+2*x+5*x^2)/(1-10*x^3).at n=20A051109
• Turban numbers: without letters r, t, or u.at n=13A072956
• Expansion of (1-5*x)/(1-10*x).at n=7A093143
• a(n)=Product{k=0..n, 1+4^A010060(k)}/2.at n=13A101654
• Powerful(1) numbers (A001694) whose digit reversal is a pentagonal number (A000326).at n=24A115695
• Numbers k such that k and k^2 use only the digits 0, 2, 3 and 5.at n=48A136887
• Numbers k such that k and k^2 use only the digits 0, 2 and 5.at n=18A136910
• Numbers k such that k and k^2 use only the digits 0, 2, 5 and 7.at n=25A136915
• Numbers k such that k and k^2 use only the digits 0, 2, 5 and 8.at n=28A136918
• Numbers k such that k and k^2 use only the digits 0, 2, 5 and 9.at n=44A136920
• Denominator of Bernoulli(n, -1/10).at n=7A158996
• Number of compositions of even natural numbers in 7 parts <= n.at n=9A191494
• Number of compositions of odd natural numbers into 7 parts <=n.at n=9A191900
• Numbers covering A000027: a(n) = (1, 1, 2, 5) * A011557(n).at n=27A194350
• Period of powers of 3 mod 10^n.at n=7A216099