OFFSET
1,1
COMMENTS
FORMULA
Number 171 is in sequence because 1*7*1=7.
MATHEMATICA
Flatten[Table[Select[FromDigits/@Permutations[PadRight[{7}, n, 1]], CompositeQ], {n, 9}]]//Sort (* Harvey P. Dale, Mar 29 2023 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Jaroslav Krizek, Nov 25 2011
STATUS
approved