A062526 9^a(n) is smallest power of 9 containing the string 'n'.

5, 0, 3, 6, 5, 4, 4, 3, 2, 1, 11, 15, 18, 11, 6, 18, 17, 19, 13, 23, 9, 8, 14, 21, 12, 13, 26, 28, 12, 3, 8, 6, 13, 24, 10, 18, 12, 27, 9, 27, 10, 6, 9, 8, 6, 14, 8, 7, 9, 5, 18, 16, 18, 6, 13, 35, 4, 20, 13, 5, 11, 4, 23, 18, 12, 4, 17, 8, 24, 7, 22, 17, 3, 26, 9, 30

Offset: 0

Author

Robert G. Wilson v, Jun 24 2001

Keywords

• base
• nonn

Comments

Table[k = 0; While[ StringPosition[ ToString[9^k], ToString[n] ] == {}, k++ ]; k, {n, 0, 75} ]

Crossrefs

Cf. A030000.