OFFSET
1,1
COMMENTS
a(9) is a zeroless pandigital number in base 10, with 9 digits such that every k-digit substring ( 1 <= k <= 9 ) taken from the left, is divisible by k (see A163574). - Michel Marcus, Dec 01 2013
REFERENCES
Matt Parker, Things to make and do in the fourth dimension, 2015, pages 7-9.
LINKS
Blaine, How about a math puzzle?
Albert Franck, Puzzles, see item 7.
Wikipedia, Polydivisible number
Jim Wilson, Statement of Nine-Digit Number puzzle
CROSSREFS
KEYWORD
nonn,base,fini,full
AUTHOR
Alexander R. Povolotsky, Sep 25 2009
STATUS
approved