OFFSET
1,2
LINKS
Giovanni Resta, Tridigital Triangular Numbers
FORMULA
MATHEMATICA
Flatten[Table[Select[FromDigits/@Tuples[{1, 2, 6}, n], OddQ[Sqrt[8#+1]]&], {n, 12}]] (* Harvey P. Dale, Mar 07 2015 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, May 10 2006
EXTENSIONS
a(24)-a(27) from Tyler Busby, Mar 14 2023
STATUS
approved