123456789

Appears in sequences

• Triangle of the gods: to get a(n), concatenate the decimal numbers 1,2,3,...,n.at n=8A007908
• Lengths increase by 1, digits cycle through positive digits.at n=8A007923
• a(0) = 0; for n>0, a(n) = 10*a(n-1) + n.at n=9A014824
• Largest metadrome (number with digits in strict ascending order) in base n.at n=9A023811
• Smallest number that contains the numbers from 1 to n as substrings.at n=8A035239
• Zeroless pandigital numbers: numbers containing the digits 1-9 (each appearing at least once) and no 0's.at n=0A050289
• Append n to the previous term, reverse alternate terms.at n=8A053052
• Multiples of 123456789.at n=0A053654
• n has distinct digits in ascending order and n=a-b where a has the digits of n in descending order and b has the digits of n in another order (a and b perhaps with extra zeros).at n=4A055159
• n has distinct digits in ascending order and n=a-b where a has the digits of n in descending order and b has the digits of n in another order (a and b perhaps with extra zeros).at n=3A055159
• The number n has digits in ascending order and n=a-b where a has the digits of n in descending order and b has the digits of n in another order (a and b perhaps with extra zeros), ordered by a.at n=6A055162
• The number n has digits in ascending order and n=a-b where a has the digits of n in descending order and b has the digits of n in another order (a and b perhaps with extra zeros), ordered by a.at n=9A055162
• Concatenate next digit at right hand end (where the next digit after 9 is again 0).at n=9A057137
• String together the first n numbers in an order which minimizes the result.at n=8A060555
• a(n) = (10^n-1)*(91/81)-n*10^n/9.at n=8A064616
• a(n) = (10^n-1)*(91/81)-n*10^n/9.at n=9A064616
• Let N = 123456789123456789123456789..., with the digits from 1 to 9 repeated indefinitely. Then a(n) is the n-digit number formed from the digits starting at the {n(n-1)/2 +1}-th position of N, read backwards if n is even.at n=8A066580
• Terms of A007908 which are divisible by their index.at n=5A071269
• Smallest multiple of n which begins with the concatenation of first n natural numbers.at n=8A074158
• Smallest multiple of n formed by the concatenation of n successive numbers, or 0 if no such number exists.at n=8A077306