OFFSET
1,3
COMMENTS
For indices, see A050759.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Accumulate[Range[0, 70]], FreeQ[Differences[IntegerDigits[#]], 0]&] (* Harvey P. Dale, Jun 20 2021 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Sep 15 1999
EXTENSIONS
Offset changed to 1 by Jon E. Schoenfield, Oct 18 2019
STATUS
approved