> I can't find solutions involving numbers up to 1.8E19 for the following > differences: > > 290, 442, 530, 626, 654, 738, 750, 754, 778, 842, 854, 898, 966 Neither can I, nor for 810. (But I didn't go to 1.8e19.) -- Don Reble djr at nk.ca