6666666666

Appears in sequences

• a(n) = 6*(10^n - 1)/9.at n=10A002280
• Numbers n such that n and 2n-1 are both palindromes.at n=14A069882
• Number of Fibonacci numbers F(k), k <= 10^n, which end in 2.at n=10A073548
• Number of Fibonacci numbers F(k), k <= 10^n, which end in 6.at n=10A073549
• Largest term in periodic part of continued fraction expansion of square root of n-th repunit.at n=19A096487
• a(n)*n = A112902(n).at n=9A112903
• Numbers k such that the k-th triangular number contains only digits {1,2,3}.at n=27A119098
• Numbers k such that the k-th triangular number contains only digits {1,2,4}.at n=17A119100
• Numbers k such that the k-th triangular number contains only digits {1,2,7}.at n=22A119106
• Numbers k such that the k-th triangular number contains only digits {1,2,8}.at n=28A119108
• Numbers k such that the k-th triangular number contains only digits {1,2,9}.at n=16A119110
• Numbers k such that k and k^2 use only the digits 3, 4, 5 and 6.at n=9A137120
• Numbers k such that k and k^2 use only the digits 3, 4, 5, 6 and 8.at n=21A137122
• Let s(n) be the smallest number x such that the decimal representation of n appears as a substring of the decimal representations of the numbers [0...x] more than x times.at n=5A164321
• a(n) is the smallest number x such that the decimal representation of n appears as a substring of the decimal representations of the numbers [1...x] >= x times.at n=6A164935
• Repdigit numbers n such that the repeated digit of n is equal to the digital root of n.at n=27A271569
• Conversion to octal of the binary expansion given by the first n terms of the period-3 sequence A011655 (repeat 0, 1, 1).at n=30A289006
• An explicit example of an infinite sequence with a(1)=1 and, for n >= 2, a(n) and S(n) = Sum_{i=1..n} a(i) have no digit in common.at n=19A308900