99900

Appears in sequences

• Numbers of the form 10^(m-k)*(10^(m+k+1)-10^k), m, k >= 0.at n=2A083909
• Numbers whose set of base 10 digits is {0,9}.at n=28A097256
• Denominator of the continued fraction convergents of the decimal concatenation of the powers of 10.at n=5A128876
• a(n) = n^5 - n^2.at n=10A135497
• Numbers k such that k and k^2 use only the digits 0, 1, 4, 8 and 9.at n=48A136867
• Numbers k such that k and k^2 use only the digits 0, 1, 5, 8 and 9.at n=32A136874
• Numbers k such that k and k^2 use only the digits 0, 1, 6, 8 and 9.at n=34A136879
• Numbers k such that k and k^2 use only the digits 0, 1, 7, 8 and 9.at n=34A136880
• Numbers k such that k and k^2 use only the digits 0, 1, 8 and 9.at n=32A136881
• Alexandrian integers: numbers of the form n = p*q*r such that 1/n = 1/p - 1/q - 1/r for some integers p,q,r.at n=40A147811
• a(n) = n*(2*n^2 + 5*n + 3).at n=36A163815
• Integer areas of the Lucas Central triangles of integer-sided triangles.at n=6A231739
• a(n) = Sum_{0 < x,y,z <= n and gcd(x^2 + y^2 + z^2, n)=1} gcd(x^2 + y^2 + z^2 - 1, n).at n=36A239612
• G.f. A(x) satisfies: A(x)^2 = A( x^2/(1-6*x) ), with A(0) = 0.at n=7A264225
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 113", based on the 5-celled von Neumann neighborhood.at n=32A285839
• The sum of the first n terms of the sequence is the concatenation of the first n digits of the sequence, with a(1) = 1.at n=5A300000
• Triangular array read by rows: row n shows the coefficients of the polynomial p(x,n) constructed as in Comments; these polynomials form a strong divisibility sequence.at n=17A327323
• Numbers m such that the largest digit in the decimal expansion of 1/m is 1.at n=24A333402
• Irregular triangle read by rows where T(n,k) is the number of simple graphs covering n vertices with exactly k triangles, 0 <= k <= binomial(n,3).at n=42A372167
• Number of triangle-free simple labeled graphs covering n vertices.at n=7A372168