OFFSET
0,8
COMMENTS
a(n) is a multiple of 6.
FORMULA
a(n) = n - A030106(n).
MATHEMATICA
Table[n-FromDigits[Reverse[IntegerDigits[n, 7]], 7], {n, 0, 80}] (* Harvey P. Dale, Jul 22 2015 *)
CROSSREFS
KEYWORD
base,sign
AUTHOR
Henry Bottomley, Jul 18 2000
STATUS
approved