A069572 Smallest n-digit number in which the k-th digit (from the right!) is a divisor of k, greater than 1 unless k has no single-digit divisor > 1.

1, 21, 321, 2321, 52321, 252321, 7252321, 27252321, 327252321, 2327252321, 12327252321, 212327252321, 1212327252321, 21212327252321, 321212327252321, 2321212327252321, 12321212327252321, 212321212327252321

Offset: 1

Author

Amarnath Murthy, Mar 24 2002

Keywords

• nonn
• base

Crossrefs

Cf. A069570, A069571.

Extensions

a(12) corrected by Martin Ward, Feb 12 2013