1234678

Appears in sequences

• 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=31A081539
• Concatenation of the numbers from 1 to n but omitting 5.at n=6A262575