2000000000

Appears in sequences

• Powers of 2 written in base 4.at n=19A004643
• Powers of 2 written in base 8.at n=28A004647
• Numbers k such that k^2 + k + 4 is a palindrome.at n=24A027716
• Numbers k such that k^3 has at most two different digits.at n=24A030292
• Numbers having the same number of digits as letters in their US English spelling.at n=1A030455
• a(n) = ceiling(sqrt(4*10^n)).at n=18A035071
• a(n) is the index of the smallest triangular number containing exactly n 0's.at n=16A048355
• Expansion of g.f. (1+2*x+5*x^2)/(1-10*x^3).at n=28A051109
• a(n)=2*a(n-1), except every tenth time you multiply by 1000/512 instead of by 2.at n=31A051535
• a(n) = floor(10^10/n).at n=4A057072
• a(n) = gcd(n^n, phi(n^n)).at n=9A064448
• Expansion of (1 - 8*x)/(1 - 10*x).at n=10A093136
• Erroneous version of A052216.at n=18A094629
• 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=26A098408
• Lexicographically earliest increasing sequence whose k-th digit is the absolute difference between the two digits touching the k-th comma.at n=29A102663
• Coefficient of q^n in (1-q)^5/(1-5q); dimensions of the enveloping algebra of the derived free Lie algebra on 5 letters.at n=14A118266
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 7.at n=15A136884
• Numbers k such that k and k^2 use only the digits 0, 2, 4 and 6.at n=19A136902
• Numbers k such that k^4 has exactly 3 different decimal digits.at n=22A155149
• The decimal representation of the average of the digits of n starts with the digits of n.at n=20A257829