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Message: [QUOTE="russell kym horsell, post: 2453276"] Some kind of pdf encoder, eh? There's probably a lot of literature on smart tricks, but the basic idea (beside simply using 64-bit integers and brute force -- BTW even 32-bit PC's can do h/w 64-bit arith these days) is to note that X % 900 = Y % 900 = y4. Then we see that 256^5 % 900 = 376 256^4 % 900 = 796 256^3 % 900 = 316 256^2 % 900 = 736 256^1 % 900 = 256 So we must have y4 = (376*x1 + 796*x2 + 316*x3 + 736*x4 + 256*x5 + x6) % 900 . (Look, maw, only 16-bit arithmetic!) Similiarly for the other y_i. [/QUOTE]