OFFSET
1,1
LINKS
Giovanni Resta, Tridigital Triangular Numbers
MATHEMATICA
Flatten[Table[Select[FromDigits/@Tuples[{2, 5, 6}, n], OddQ[Sqrt[8#+1]]&], {n, 16}]] (* Harvey P. Dale, Nov 03 2015 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(22)-a(23) from Tyler Busby, Mar 24 2023
STATUS
approved