200000000

Appears in sequences

• a(n) = 2*n^(n-2).at n=9A003308
• Powers of 2 written in base 4.at n=17A004643
• Powers of 2 written in base 8.at n=25A004647
• Powers of 2 written in base 16.at n=33A004655
• Numbers k such that k^2 contains exactly 2 distinct digits.at n=43A016069
• Denominator of sum of -10th powers of divisors of n.at n=9A017684
• Numbers k such that k^2 + k + 4 is a palindrome.at n=22A027716
• Numbers k such that k^3 has at most two different digits.at n=22A030292
• a(n) = floor(10^9/n).at n=4A033423
• a(n) = ceiling(sqrt(4*10^n)).at n=16A035071
• a(n) is the index of the smallest triangular number containing exactly n 0's.at n=14A048355
• Expansion of g.f. (1+2*x+5*x^2)/(1-10*x^3).at n=25A051109
• Numbers n such that Sum_{k=1..n} d(k) is an integer where d(k) is the decimal fraction 0.k (e.g. d(999)=0.999).at n=15A054464
• Expansion of (1 - 8*x)/(1 - 10*x).at n=9A093136
• Erroneous version of A052216.at n=16A094629
• 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=23A098408
• Concatenate number of occurrences in n of each decimal digit from 0 to 9 and drop leading zeros.at n=11A100909
• Numbers k such that the k-th triangular number contains only digits {0,1,2}.at n=26A119034
• a(n) = n^3 * 5^n.at n=8A128791
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 7.at n=12A136884