OFFSET
1,3
MATHEMATICA
Union[Flatten[FromDigits[#, 7]&/@Select[Permutations[Range[0, 6], 6], Min[ Differences[#]]>0&]]] (* Harvey P. Dale, Jul 25 2013 *)
CROSSREFS
KEYWORD
nonn,base,fini,full,easy
AUTHOR
EXTENSIONS
More terms from Sean A. Irvine, Jun 10 2019
STATUS
approved