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One more guess: 390.
718?
Seems to be working again!

428
JACKPOT

777

DING DING DING DING
Let's keep it going :-)

430
Seems to be working again...

Thread checked through DeMignon's guess of 430.

Not guessed yet.

It I counted right, 366 of the possible answers have been guessed. Roughly 37%
Post edited October 03, 2017 by OldFatGuy
avatar
OldFatGuy: Seems to be working again...

Thread checked through DeMignon's guess of 430.

Not guessed yet.
635
769
419
429

..isn't a prime.
770
629
.. but

421

is.
58 :)
433

too.