3000000000

Appears in sequences

• Powers of 3 written in base 9.at n=19A004663
• a(n) is root of square starting with digit 9: first term of runs.at n=16A035076
• Numbers k such that Sum_{j=1..k} d(j) is an integer where d(j) is the decimal fraction 0.2j (e.g., d(14) = 0.28).at n=15A054465
• Expansion of (1-7x)/(1-10x).at n=10A093138
• a(n) = floor(n^(1/2)*10^n).at n=8A093471
• a(1) = 1; for n>1, a(n) = smallest number > a(n-1) such that last digit of a(n-1) + first digit of a(n) = 3.at n=27A098408
• Length of the cycle for Lucas numbers mod 10^n.at n=9A114307
• a(n) is the minimal difference between two distinct n-digit numbers with property that when one of them is typed into a calculator and rotated 180 degrees, the other one is seen.at n=18A125521
• Numbers k such that k and k^2 use only the digits 0, 1, 3 and 9.at n=20A136853
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 7 and 9.at n=29A136895
• Numbers k such that k and k^2 use only the digits 0, 3, 5 and 9.at n=14A136942
• Numbers k such that k and k^2 use only the digits 0, 3, 7, 8 and 9.at n=33A136947
• Triangular sequence of coefficients of characteristic polynomials rational matrices of a type: M(3)= {{0, -3/2, 0}, {-3/2, 0, -3/2}, {0, -3/2, 0}}.at n=57A137949
• Numbers k such that k^4 has exactly 3 different decimal digits.at n=23A155149
• Numbers k such that k^2 contains exactly 2 distinct digits and k^3 contains exactly 3 distinct digits.at n=14A247047
• The decimal representation of the average of the digits of n starts with the digits of n.at n=21A257829