7654321

Appears in sequences

• Concatenation of numbers from n down to 1.at n=6A000422
• Number of zeros in numbers 1 to 111...1 (n+1 digits).at n=6A014925
• Add (n mod 10)*10^(n-1) to the previous term, with a(0) = 0.at n=7A057138
• Smallest lucky number with a decimal expansion starting n, n-1, ..., 2, 1.at n=6A057610
• String together the first n numbers in an order which maximizes the result.at n=6A060554
• Dealing cards in a game of solitaire.at n=28A071761
• Triangle read by rows: the n-th row contains n numbers sorted in decreasing value, each build by dropping a different number from the sequence [n,n-1,n-2,....,1] and concatenating the n-1 others. By definition the first row contains 0.at n=35A081541
• Concatenation of digits of natural numbers from n down to 1.at n=6A104759
• Integers written in base "triangle".at n=28A110301
• a(n) = 1 + 2*n + 3*n^2 + 4*n^3 + 5*n^4 + 6*n^5 + 7*n^6.at n=10A113532
• Semiprimes with consecutive digits.at n=23A118697
• Factorial codes for the fixed points of the square of Vaillé's 1997 bijection on Dyck paths.at n=19A126299
• a(n) = concatenation of reversed digits of natural numbers from n down to 1.at n=6A138793
• Reverse (palindrome) of A164844.at n=42A168647
• Semiprimes with digits in descending order that differ exactly by 1.at n=14A215478
• Numbers n = x0 x1...x9 such that sum of digits (mod 10) - xi == i+1 mod 10.at n=5A226465
• Given a number n with k digits d_i, enumerate the positions of the digits starting from LSD = 1 to MSD = k. Sequence lists the numbers such that Sum_{i=1..k} d_i/i and Sum_{i=1..k} i/d_i are equal and integer.at n=22A260487