[D66] Digit Curios!
René Oudeweg
roudeweg at gmail.com
Wed Feb 14 23:12:34 CET 2024
L.S.
Henry Ernest Dudeney's 3-by-3 magic square (sum=111) contains "1"
nonprime:
67 01
43
13
37
61
31
73
07
R.O.
Nieuwe publicatie:
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