Chappy
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Enigma 1691 - Factory parts
New Scientist magazine, 31 March 2012.
By Gwyn Owen.
The number 3120 is divisible without remainder
by each number in the following set: 3, 312,
12, 120, 2 and 20. Each of these numbers will
be called a visible proper divisor (VPD) of
3120 because each is visible either as a single
digit or as a group of adjacent digits in 3120.
(1 and 3120 have been excluded as being improper,
in order that any prime number has no VPDs).
ENIGMA represents an odd six-digit number in
which all the digits are different. The set
of all VPDs of ENIGMA is E, NI, IG, G, GMA,
M, MA, and A. What is ENIGMA?
Ciao,
Chappy.