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A114879
Numbers n coprime to 3 such that there exists an (n-1)-digit ternary number wherein each substring is indivisible by n.
0
2, 4, 5, 10, 20, 37
OFFSET
1,1
COMMENTS
a(7) > 64.
EXAMPLE
20 is there because each substring of 1121212211122121211 (base 3) is indivisible by 20.
KEYWORD
nonn,base,more,hard
AUTHOR
Don Reble, Feb 17 2006
STATUS
approved