Search a number
centered triangular n.  and  plaindrome

Search a number

(max 15 digits)

First numbers that belong to both sets:

1, 4, 19, 46, 136, 166, 199, 235, 1135, 1489, 1999, 2224, 4456, 4789, 11224, 12559, 114679, 122266, 233446, 333469, 1224469, 3666799, 4455679, 12222256, 111236899, 1344555888889.