66666666

Appears in sequences

• a(n) = 6*(10^n - 1)/9.at n=8A002280
• Repdigit + 1 is prime.at n=10A028988
• a(n) = floor(10^9/n).at n=14A033423
• a(0) = 1; a(n) is obtained by incrementing each digit of a(n-1) by 5.at n=7A061519
• Numbers n such that n and 2n-1 are both palindromes.at n=12A069882
• Number of Fibonacci numbers F(k), k <= 10^n, which end in 2.at n=8A073548
• Number of Fibonacci numbers F(k), k <= 10^n, which end in 6.at n=8A073549
• a(n) = A084006(n)^(1/2).at n=21A084007
• Largest term in periodic part of continued fraction expansion of square root of n-th repunit.at n=15A096487
• Concatenate n F(n) times.at n=5A118117
• Least concatenation of n to have exactly n prime factors with multiplicity.at n=5A118133
• Numbers k such that the k-th triangular number contains only digits {0,1,2}.at n=25A119034
• Numbers k such that the k-th triangular number contains only digits {1,2,3}.at n=22A119098
• Numbers k such that the k-th triangular number contains only digits {1,2,4}.at n=13A119100
• Numbers k such that the k-th triangular number contains only digits {1,2,5}.at n=31A119102
• Numbers k such that the k-th triangular number contains only digits {1,2,6}.at n=33A119104
• Numbers k such that the k-th triangular number contains only digits {1,2,7}.at n=18A119106
• Numbers k such that the k-th triangular number contains only digits {1,2,8}.at n=24A119108
• Numbers k such that the k-th triangular number contains only digits {1,2,9}.at n=13A119110
• Numbers k such that k and k^2 use only the digits 1, 3, 4, 5 and 6.at n=42A137021