OFFSET
1,3
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
MAPLE
filter:= proc(n) local t;
t:= convert(n*(n+1)/2, base, 10);
not member(0, t[2..-1]-t[1..-2])
end proc:
select(filter, [$0..100]); # Robert Israel, Oct 14 2024
MATHEMATICA
Select[Range[0, 88], FreeQ[Differences[IntegerDigits[(#^2+#)/2]], 0]&] (* Jayanta Basu, May 31 2013 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Sep 15 1999
EXTENSIONS
Name clarified and offset changed to 1 by Jon E. Schoenfield, Oct 16 2019
STATUS
approved