OFFSET
1,2
REFERENCES
D. Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986, 93.
LINKS
Patrick De Geest, Subsets of palindromic triangulars
Patrick De Geest, For the last term
MATHEMATICA
palQ[n_] := Reverse[x = IntegerDigits[n]] == x; t = {}; Do[If[palQ[n] && palQ[n*(n + 1)/2], AppendTo[t, n]], {n, 1.2*10^7}]; t (* Jayanta Basu, May 15 2013 *)
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
STATUS
approved