OFFSET
1,1
COMMENTS
By definition a subset of A039562. The number 4005, for example, is in A039562 but not in here. - R. J. Mathar, May 23 2008
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..4000
MATHEMATICA
Union[ Map[ Plus@@(Array[ (4^#)&, Length[ # ], 0 ]*#)&, Flatten[ Table[ Permutations[ Join[ Range[ 4-1 ], Array[ 0&, k ] ] ], {k, 0, 2} ], 1 ] ] ]
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved