|
|
A097654
|
|
Numbers n such that n=|d_1!!-d_2!!+...+(-1)^(k-1)*d_k!!| where d_1 d_2 ... d_k is the decimal expansion of n.
|
|
2
|
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
EXAMPLE
|
380 is in the sequence because 380=|3!!-8!!+0!!|.
|
|
MATHEMATICA
|
Do[h=IntegerDigits[n]; l=Length[h]; If[n==Abs[Sum[(-1)^(k-1) *h[[k]]!!, {k, l}]], Print[n]], {n, 4*9!!}]
|
|
CROSSREFS
|
|
|
KEYWORD
|
base,fini,full,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|