1234567

Appears in sequences

• Concatenations of cyclic permutations of initial positive integers.at n=21A001292
• Triangle of the gods: to get a(n), concatenate the decimal numbers 1,2,3,...,n.at n=6A007908
• a(0) = 0; for n>0, a(n) = 10*a(n-1) + n.at n=7A014824
• Positive numbers k such that k and 6*k are anagrams in base 8 (written in base 8).at n=22A023077
• Smallest number that contains the numbers from 1 to n as substrings.at n=6A035239
• Append n to the previous term, reverse alternate terms.at n=6A053052
• Concatenate next digit at right hand end (where the next digit after 9 is again 0).at n=7A057137
• a(n) = floor(10^(n+1)/81).at n=7A057932
• String together the first n numbers in an order which minimizes the result.at n=6A060555
• In the following triangle the n-th row contains n n-digit (or (n-1)-digit) numbers whose concatenation (with a 0 prefixed for (n-1)-digit numbers) gives a substring of the cyclic concatenation of 1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,1,2,...: 1; 12 34; 123 456 789; 1234 5678 9012 3456; 12345 67890 12345 67890 12345; ... Sequence contains the triangle by rows.at n=21A078194
• a(n) = numerator(N), where N = 0.123...n (concatenation of 1 to n after decimal point).at n=6A078258
• Triangle read by rows in which the n-th row contains the n numbers in increasing order formed by the concatenation of first n-1 numbers. (The digits of the numbers with 2 or more digits are taken as one entity.) First row is taken to be 0.at n=28A081539
• Let S = 12345678901234567890123456..., the cyclic concatenation of digits; partition this string into distinct squarefree numbers. To avoid leading zeros, no member may end with the digit 9.at n=30A085944
• a(n) = A014824(2*n-1).at n=3A095761
• a(0)=0; a(1)=2. Slowest increasing sequence where every digit "d" has a copy of itself in a(n+d).at n=30A102150
• a(n) = min{p + q + r + ...} where p,q,r,... are distinct unary numbers - containing only ones, i.e., of the form (10^k - 1)/9 - formed by using a total of n ones.at n=27A110380
• Semiprimes (A001358) which are the concatenation of the numbers 1 through n for some n.at n=2A116935
• Semiprimes with consecutive digits.at n=22A118697
• Numbers with digits in ascending order that differ exactly by 1.at n=39A138141
• Concatenation of the reversed digits of numbers from 1 to n.at n=6A138957