512345

Appears in sequences

• a(n) is the smallest number not already in the sequence, such that the concatenation of all a(n) displays the periodic digit string 1, 2, 3, 4, 5 (and repeat).at n=29A165303
• Lexicographically earliest sequence of distinct positive numbers such that if we add ten successive digits the result is divisible by 10.at n=41A327735
• Concatenation of the decimal digits of {n, 1..n}.at n=4A357915