3000000

Appears in sequences

• Powers of 3 written in base 9.at n=13A004663
• Powers of 3 written in base 27.at n=19A004669
• Liponombres: numbers whose French name does not contain the letter "e".at n=25A014254
• Numbers k such that k^2 contains exactly 2 distinct digits.at n=38A016069
• Numbers k such that k^2+k+9 is a palindrome.at n=35A027726
• a(n) is root of square starting with digit 9: first term of runs.at n=10A035076
• Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*10^j.at n=26A038252
• Triangle whose (i,j)-th entry is binomial(i,j)*10^(i-j)*5^j.at n=22A038307
• Triangle read by rows: T(j,k) is the number of acyclic functions from {1,...,j} to {1,...,k}. For n >= 1, a(n) = (k-j)*k^(j-1), where k is such that C(k,2) < n <= C(k+1,2) and j = (n-1) mod C(k,2). Alternatively, table T(k,j) read by antidiagonals with k >= 1, 0 <= j <= k: T(k,j) = number of acyclic-function digraphs on k vertices with j vertices of outdegree 1 and (k-j) vertices of outdegree 0; T(k,j) = (k-j)*k^(j-1).at n=52A058127
• Triangle, read by rows, of coefficients for the third iteration of the hyperbinomial transform.at n=28A089463
• Expansion of (1-7x)/(1-10x).at n=7A093138
• 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=18A098408
• Expansion of 1/(1 - 100*x^2 - 100*x^3).at n=7A112525
• a(n) is the least nonnegative integer in base 10 containing n zeros that is divisible by n.at n=5A112889
• Length of the cycle for Lucas numbers mod 10^n.at n=6A114307
• 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=12A125521
• Main diagonal of table of length of English names of numbers.at n=9A129774
• Numbers k such that k and k^2 use only the digits 0, 1, 3, 4 and 9.at n=34A136841
• Numbers k such that k and k^2 use only the digits 0, 1, 3, 5 and 9.at n=23A136846
• Numbers k such that k and k^2 use only the digits 0, 1, 3 and 9.at n=14A136853