Question
A number is called elegant if, for all 0 d 9, the digit d does not appear more than d times. For example, the number
A number is called elegant if, for all 0 d 9, the digit d does not appear more than d times. For example, the number 3 cannot appear more than 3 times in an elegant number (and the digit 0 cannot appear at all). How many positive 4-digit elegant numbers exist? Some numbers to include are 1345, 5999, 6554, and 7828.
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Database Systems For Advanced Applications 16th International Conference Dasfaa 2011 International Workshops Gdb Sim3 Flashdb Snsmw Damen Dqis Hong Kong China April 2011 Proceedings Lncs 6637
Authors: Jianliang Xu ,Ge Yu ,Shuigeng Zhou ,Rainer Unland
2011th Edition
3642202438, 978-3642202438
