OFFSET
1,9
COMMENTS
a(8)=8-R(9)=8-9=-1; a(15)=15-R(16)=15-61=-46; a(27)=27-R(28)=27-82=-55
MATHEMATICA
#[[1]]-FromDigits[Reverse[IntegerDigits[#[[2]]]]]&/@Partition[Range[70], 2, 1] (* Harvey P. Dale, Apr 22 2013 *)
CROSSREFS
KEYWORD
base,sign
AUTHOR
Claudio Meller, May 30 2009
STATUS
approved