9 OCTOBER 1915, Page 13

A SEQUENCE OF 13's.

rTo TES EDITOR OP THII " SPROTATOR."1 SIR,—In describing a curious numerical coincidence in the Spectator of October 2nd your correspondent writes : "My ticket was numbered in such a way that the four digits totalled 26 and the whole was divisible by 26. I leave your readers to discover what that number was." May I point out that the problem, as he states it, cannot be ,solved without ambiguity ? There are nine numbers which fulfil these conditions—viz., 1,898, 5,876, 6,578, 7,748, 7,982, 8,684, 8,918, 9,386, and 0,854. Any one of these might have been the number of his ticket.—I am, Sir, &c., A. A. R.