123123123

Appears in sequences

• Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,2,3.at n=8A037610
• a(n) = n concatenations of numbers from 1 to n, concatenated.at n=2A105311
• Sorted list of primitive strings that can be obtained by starting with 123 and repeatedly doubling any substring in place.at n=16A135479
• 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 (and repeat).at n=24A165301